Computer General Knowledge

Google

About google

Founded -----Menlo Park, California, U.S. (September4, 1998)

Founder(s) ---Larry page, Sergey Brin

Headquarters---Googleplex, Mountain view, California, united states

Key person--- Sundar Pichai

Eric Schmidt--- (Executive Chairman), Sergey Brin (Co-Founder)

Revenue ----- US$66.001 billion (2014)

Total assets---Increase US$131.133 billion (2014)

Total equity---US$104.5 billion (2014)

Operating income---US$ 16.496 billion (2014)

Net Income---US$14.444 billion (2014)

YAHOO!

Funded---Santa Clara, California, U.S. (March 1995)

Founder(s) ---Jerry Yang, David filo.

Headquarters---Sunnyvale, California, U.S

Key person--- Maynard Webb

Product---Yahoo News, Yahoo Mail, Yahoo Finance, Yahoo Sports, Yahoo Search, Yahoo Messenger, Yahoo! Answers, Tumbler, Flickr

Revenue--- US$4.61 billion (2014)         

Net Income--- US$7.52 billion (2014)

Total assets--- US$61.9 billion (2014)

Total equity--- US$38.74 billion (2014)

Operating income--- US$143 billion (2014)

Alexa rank---5(January 2016)

BING

www.bing.com

Slogan---Bing is for doing.(2012). Bing and decide (2009)

Commercial? ---yes

Types of site---search engine

Available in---40 languages

Written in--- ASP.NET

Owner---Microsoft

Created by ---Microsoft

Launched---June 1, 2009

Alexa rank---17

MSN

www.msn.com

Commercial? ---Mixed

Type of web portal

Written in---ASP.NET

Owner---Microsoft

Launched---August24, 1995

Alexa rank---23(December 2015)

Microsoft

www.microsoft.com

Type---Public

Traded as---NASDAQ:MSFT, Dow Jones industrial Average Component

NASDAQ-100 Component S&P 500 Components

Industry--- Computer Software, Consumer electronics, computer hardware

Founded---April 4, 1975 Albuquerque, New Mexico, U.S

Founder(s) ---Bill Gates, Paul Allen

Headquarters---Microsoft Redmond Campus, Redmond, Washington, U.S

Key person--- John W. Thompson (Chairman), Satya Nadella (CEO), Bill Gates (Founder, technology advisor)

Product--- Windows. Office. Servers.  Skype. Visual  Studio. Dynamics. Azure. Xbox. Surface. Mobile. Visual BASIC. Visual C++. Visual Basic. Net. C#. F# etc.

Revenue--- US$ 93.58 billion(2015)

Net Income--- US$12.19 billion (2015)

Total assets--- US$ 176.22 billion (2015)

Total equity---US$80.08 billion (2015)

Wikipedia  

www.wikipedia.org

Information about Wikipedia

Type of site--- Internet encyclopedia

Available in --- 288 editions

Users---115603 active, 27233416 registered

Owner--- Wikimedia Foundation

Created by---Jimmy wales, Larry Sanger

Launched---January15, 2001

Commercial?---No

Alexa rank---7

YouTube

www.youtube.com

Funder(s) ---Steve Chen, chad Hurley, Jawed Karim

Key people---Susan wojcicki (ceo) Chad Hurly (Advisor)

Industry---Internet Video hosting service

Headquarters---901 Cherry Avenue, san Bruno, California

Parent---Independent

Facebook

www.facebook.com

Type---Public

Traded as--- NASDAQ:FB, NASDAQ-100 Component, S&P 500 Component

Founded---February 4, 2004;

Headquarters--- Menlo Park, California, Us

Founder(s) --- Mark Zuckerberg, Eduardo Saverin, Andrew McCollum, Dustin Moskovitz, Chris Hughes

Key people--- Mark Zuckerberg (chairman and CEO) Sheryl Sandberg (coo)

Industry---Internet

Revenue---US$12.466 billion

Operating income---US$4.92 billion

Net income---US$2.92 billion

Total assets---US$ 40.184 billion

Written in--- c++, PHP

Alexa rank---2

Available in--- Multilingual

Twitter

Type---Public

Traded as--- NYSE

Founded---March 21, 2006

Headquarters---San Francisco, California, United States

Area Served--- Worldwide

Founders(s) ---jack Dorsey, Noah Glass, Biz stone, Evan Williams

Chairman---Omid Kordestani

CEO---Jack Dorsey

Industry---Internet

Revenue---US$ 1.4 billion

Written In--- Java, JavaScript

Alexa rank---9

Types of site--- Social network service

LinkedIn

Type---Public

Traded as--- NYSE

Funded---December 2002

Headquarters---MountainView, California, US

Area Served---Worldwide

Founder(s) --- Reid Hoffman, Allen Blue, Konstantin Guericke, Eric Ly, Jean-Luc Vaillant

Chairman---Reid Hoffman

CEO---Jeff Weiner

Industry---Internet

Revenue---US$ 2.21 billion

Net income---US$15million

Written in---Java

Alexa rank---14

Website---www.linkedin.com

Advertising---Google AdSense

Available in---Multilingual

Launched---May 5, 2003

Contributions in computer science

Name	Contribution
Steve Jobs	Fonder of apple computers
John McCarthy	Founder of Artificial Intelligence
Ericsson	Founder of Bluetooth
Charles Babbage	Father of Computer
Dennis Ritchie	Father of ‘C’ Language
Bjarne Stroustrup	Father of ‘C++’ language
Shiva Ayyadurai	Founder of Email
Larry Page and Sergey Brin	Founder of Google
Vint Cerf	Founder of Internet
James Gosling	Father of ‘Java’
Johan Resig	Father of JQuery
Christoper Latham Sholes	Founder of Keybord
Linus Trovalds	Founder of Linux
Bill Gates and Paul Allen	Founder of Microsoft
Martin Cooper	Founder of Mobile Phones
Dougles Engelbart	Founder of Mouse
Ed Oates, Larry Ellison, Bob Miner	Founders of Oracle
Kasinus Lerdorf	Founder Of Php
Ajay V.Bhatt	Founder of USB
Tim Berners-Lee	Founder of WWW
Jurry Yang and David Filo	Founder of Yahoo

What is a file name extension?

A file name extension is set of characters that help windows understand what kind of information is in a file and what program should open it. It is called an extension because it appears at the of the file name, following a period. In the file name myfile.txt, the extension is txt. It tells windows that this is a text file that can be opened by programs associated with that extension, such as WordPad or Notepad. 

How can I control which programs are associated with a file name extension?

Every program that’s installed on your computer is designed to open one or more particular file types, each of which is identified by a file name extension. If you have more than one program on your computer capable of opening a file type, then one program is set as the default. To change the program that automatically opens a types of file, see. 

What is the maximum length of a file name?

Windows usually limits file names to 260 characters. But the file name must actually be shorter than that, since the complete path (such as C:\Program File\filename.txt) is included in this character count. This is why you might occasionally encounter an error when copying a file with a very long file name to location that has a longer path than its current location.

Which characters can’t be used in file name?

You cannot use any of the following characters in file name: \/? :*’’><|

How can I see file name extensions in the file name?

By default, windows hides file name extensions to make file names easier to read, buy you can choose to make extensions visible. For more information, see

How do I change a file name extension?

Usually, file name extensions should not be changed because you might not be able to open or edit the file after doing so. Sometimes, however, changing the file name extension can be useful- such as when you need to change a text file (.txt) to an HTML file (.htm) so that you can view it in a web browser .To change a file name extension, first ensure that file name are visible. Then, right-click the file you want to change and click rename. Delete the file name extension, type the new extension, and then press ENTER. Windows will warn you that changing the file name extension might cause the file to stop working properly. If you are certain that the extension you typed is one that the program you are using will understand, click yes to confirm the change. 

Text Files Extensions

.doc= Microsoft Word Document

.docx= Microsoft Word Open XML Document

.log= Log file

.msg= Out Look Mail Message

.odt= Open Document Text Document

.pages= Pages Document

.rtf= Rich Text Format File

.tex= Latex Source Document

.txt=Plain text file

.wpd= WordPerfect Document

.wps=Microsoft works word processor document

Data Files

.csv= Comma Separated Values File

.dat= Data File

.gbr= Gerber File

.ged= GEDCOM Genealogy Data File

.ibooks=Multi-Touch iBook

.key=Keynote Presentation

.keychain=Mac OS X Keychain File

.pps=PowerPoint Open XML Presentation

.sdf=Standard Data File

.tar=Consolidated UNIX File Archive

.tax2012= Turbo Tax 2012 Tax Return

.vcf=vCard File

.xml= XML File

Audio Files

.aif= Audio Interchange File Format

.iff=Interchange File Format

.m3u.Media Playlist File

.m4a= MOEG-4 Audio File

.mid= MIDI File

.mp3=MP3 Audio File

.mpa=MPEG-2 Audio File

.ra= Real Audio File

.wav=WAVE Audio File

.wma=Windows Media Audio File

Video Files

.3g2=3GPP2 Multimedia File

.3gp=3GPP Multimedia File

.asf= Advanced Systems Format File

.asx=Microsoft ASF Redirector File

.avi= Audio Video Interleave File

.flv= Flash Video File

.mov= Apple Quick Time Movie

.mpg=MPEG Video File

.rm=Real Media File

.srt= SubRip Subtitle File

.swf=Shockwave Flash Movie

.vob=D Video Object File

.wmv=Windows Media Video File

3D

.3dm=Rhino 3D Model

.3ds=3D Studio Scene

.max=3ds Max Scene File

.obj= Wavefront 3D Object File

Raster Image Files

.bmp=Bitmap Image File

.dds=DirectDraw Surface

.gif=Graphical Interchange Format File

.jpg=JPEG Image

.png=Portable Network Graphic

.psd= Adobe Photoshop Document

.pspimage=PaintShop Pro Image

.tag=Targa Graphic

.thm=Thumbnail Image File

.tif=Tagged Image File

.tiff=Tagged Image File Format

.yuv=YUV Encoded Image File

Vector Image Files

.ai=Adobe Illustrator File

.eps=Encapsulated PostScript File

.ps=PostScript File

.sug=Scalable Vector Graphics File

Page Layout Files

.indd=Adobe InDesign Document

.pct= Picture File

.pdf=Portable Document Format File

Spreadsheet Files

.xlr=Works Spreadsheet

.xls=Excel Spreadsheet

.xlsx=Microsoft Excel Open XML Spreadsheet

Database Files

.accdb=Access 2007 Database File

.db=Database File

.dbf=Database File

.mdb=Microsoft Access Database

.pdb=Program Database

.sql=Structured Query Language Data File

Executable File

.apk=Android Package File

.app= Mac OS X Application

.bat=DOS Batch File

.cgi= Common Gateway Interface script

.com=DOS Command File

.exe=Windows Executable File

.gadget=Windows Gadget

.jar= Java Archive File

.pif= Program Information File

.vb=VBScript File

.wsf=Windows Script File

Gage File

.dem=Video Game Demo File

.gam=Saved Game File

.nes=Nitendo (NES) ROM File

.rom=N64 Game ROM File

.sav=Saved Game

CAD File

.dwg= AutoCAD Drawing Database File

.dxf=Drawing Exchanging Format File

.gps=GPS Exchange File

.kml=Keyhole Markup Language File

Web File

.asp=Active server Page

.aspx=Active Server Page Extended File

.cer=Internet Security Certificate

.cfm=ColdFusion Markup File

.csr=Certificate Signing Request File

.css=Cascading Style Sheet

.htm=Hypertext Markup Language File

.html=Hypertext Markup Language File

.js=JavaScript File

.jsp=Java Server Page

.php=PHP Source Code File

.rss=Rich Site Summary

.xhtml=Extensible Hypertext Markup Language File

Plugin File

.crx=Chorme Extension

.plugin=Mac OS X Plug-in

Font Files

.fnt= Windows Cabinet File

.fon=Generic Font File

.otf=Open Type Font

.ttf= True Type Font  

System Files

.cab=Windows Cabinet File

.cpl=Windows Control File

.cur=Windows Cursor

.desthemepack=Windows 8 Desktop Theme Pack File

.dll=Dynamic Link Library

.dmp=Windows Memory Dump

.drv=Device Driver

.icns=Mac OS X Icon Resource File

.ico=Icon File

.Ink=Windows File Shortcut

.sys=Windows System File

Settings Files

.cfg=Configuration File

.ini=Windows Initialization File

.prf=Outlook Profile File 

Encoded Files

.hqx=BinHex 4.0 Encoded File

.mim=Multi-Purpose Internet Mail Message File

.uue=Uuencoded File

Compressed Files

.7z=7-Zip Compressed File

.cbr=Comic Book RAR Archive

.deb=Debian software Package

.gz=Gnu Zipped Archive

.pkg=Mac OS X Installer Package

.rar=WinRAR Compressed Archive

.rpm=Red Hat Package Manager File

.sitx=Stufflt X Archive

.tar.gz=Compressed Tarball File

.zip=Zipped File

.zipx=Extended Zip File

Disk Image Files

.bin=Binary Disc Image

.cue=Cue Sheet File

.dmg=Mac OS X Disc Image

.iso=Disc Image File

.mdf=Media Disc Image File

.toast=Toast Disc Image

.vcd=Virtual CD

Developer Files

.c=C/C++ Source Code File

.class=Java Class File

.cpp=C++ Source Code File

.cs=Visual C# Source Code File

.dtd= Document Types Definition File

.fla=Adobe Flash Animation

.h=C/C++ Header File

.java=Java Source Code File

.lua=Lua Source File

.m=Objective-C Implementations File

.pl=Perl Script

.py=Python Script

.sh=Bash Shell Script

.sln=Visual Studio Solution File

.vcxproj=Visual C++ Project

.xcodeproj= Xcode Project 

Backup Files

.bak=Backup File

.tmp=Temporary File

Misc Files

.crdownload=Chrome Partially Download File

.ics=iCalender File

.msi=Windows Installer Package

.part= Partially Downloaded File

.torrent=Bit Torrent File