Some sites require you to enter a password to access certain sections of the site. You can obtain a password by registering on the site, which is usually done by completing an online form. Some sites require you to pay a fee. This includes, for example: News sites like The Wall Street Journal; Technical Assistance sites of many companies; Sites that contain private information that is sold as financial or research sites; and extranet sites.
About web browsers: A web browser is software used to access the World Wide Web. A web browser (also known as client software) retrieves information from remote web servers and displays a web page. The two most popular web browsers are Netscape and Microsoft. Both browsers work basically the same way. Once you know one, you can easily use the other. Firefox is another example of a web browser.