A browser is an application that allows your to see the World Wide Web. The World Wide Web (WWW) is a part of the Internet. E-mail, Newsgroups, telnet, FTP are all parts of the Internet as well. They also have programs that allow them to be used. The WWW is what most people will refer to as "The Internet".
Below is a short description of the most popular browsers.
Microsoft Internet Explorer
Internet Explorer, made by Microsoft, is currently in version 5. Internet Explorer is the foundation for Windows 98 and it is on all new computers as well. If you bought a computer within the last 2 years you have Internet Explorer loaded on your computer.
Mozilla Firefox is a free and open-source web browser developed for Windows, OS X, and Linux, with a mobile version for Android, by the Mozilla Foundation and its subsidiary, the Mozilla Corporation. Firefox uses the Gecko layout engine to render web pages, which implements current and anticipated web standards.
An Internet browser developed by Google Inc. that combines a minimal design with sophisticated technology to make the Web faster, safer and easier. The Google Chrome browser offers features including access to favorite pages instantly with thumbnails, desktop shortcuts to launch Web applications, and independently run tabs within the browser to prevent browser crashing. Chrome browser is available for Windows Vista and Windows XP SP2.