Below is a short description of each of the browsers. If you are unsure which browser you are using, the title of the browser will usually be in the address bar along the top of the window (where the minimise button, close button, etc are). Also, try going to the Help menu and choosing the 'About' option. You will see the name of your browser and the version number in there.
Internet Explorer This browser is shipped Microsoft Windows. Therefore, if you have not actively downloaded a different browser, you are probably using this one. The most recent version is Internet Explorer 8.
Mozilla Firefox Known by many as just Firefox, this is a free browser produced by the open-source community. Developers, many of whom are unpaid by Mozilla, contribute their own time and effort into creating this browser (in fact, approximately 50% of the code in the Firefox browser was written by unpaid volunteers). Version 3 was released on June 17th 2008, and in the 24 hour period following its release was downloaded over 8 million times worldwide. It is compiled and distributed by Mozilla Corporation. Firefox can be used on all of the three main platforms - Windows, OS X and various distributions of Linux. The current version number is 3.6.
Google Chrome This is a browser released by Google, currently at version 4.0.249.78. It boasts a separate process for each tab, so that if one tab crashes, the entire browser will not hang. An operating system designed by Google specifically for netbooks is set to be released later this year, called Google Chrome OS, which will feature the Google Chrome browser as the only program.
Safari This is the default browser for any computer produced by Apple (MacBook, iMac, etc). It is also the browser you will be using if you are connecting to the Internet using your iPhone or your iPod Touch. Safari has also been released for Windows users.
Opera This browser is produced by the Opera Software company. Currently at Version 10.10, it is the browser you will be using if you connect to the Internet using your Nintendo Wii or Nintendo DS consoles, and many other mobile devices such as phones and PDAs. Television set-top boxes will usually use a 'lite' version of Opera for any web services. Download links:
Thanks Mozilla
again internet explorer
At work I use Firefox.