Despite the prevelance of Internet usage these days, confusion still abounds about Web Browsers, what they do and why we need them.
"Probably the very first website anyone should visit!"
A web browser is a computer program that allows you to access and "browse" the world wide web.
The Internet is a network of interconnected computers and servers carefully controlled by software that allows the fast and efficient movement of data globaly.
The World Wide Web
The World Wide Web (WWW) is a software layer that runs over the Internet that allows easy distribution of images, photos and documents generally wrapped up in webpages.
The Internet versus World Wide Web
The terms "Internet" and "World Wide Web" are often used interchangeably, but you should be aware that there are subtle differences.
For example you could send an instant chat message to a friend and most likely this will be sent over the Internet via a different system; the same goes for programs such as Skype, which sends your voice and not images and documents.
For simplicity you can consider that what you see in your browser is the World Wide Web.
A URL (or Universal Resource Location) is the part of a web address that says where the browser should look for a resource and how to retrieve it. http://www.google.com is a URL.
A URI (or Universal Resource Indicator) is a complete web address. The URL indicates where a resource (image, photo, webpage or other element) can be found. http://www.google.com/my_webpage.html is a URI.
A domain is the main section of a web address. Google.com for example is a domain, as is WhatIsABrowser.info.
A web address is a general, common term for a URI, although somtimes the term URL is used interchangably.
Hyper Text Transfer Protocol is the software protocol used by the WWW to transfer documents over the Internet.
Hyper Text Markup Language is the language used to create and design webpages.