When you clicked on the word hyperlink to get to this page, you were using a hyperlink.

A hyperlink is a special area on a Web page which can be activated (usually with a mouse). The hyperlink can appear as text or graphics.

Most hyperlinks take you to another Web page. Other hyperlinks perform special functions, such as sending email, submitting a form, accessing an ftp site, execute a database query, or access a Usenet newsgroup.

Every browser has a function which backs up to the previous page. In Lynx this is done by pressing the left-arrow; in Netscape and Mosaic you press a button with a left arrow. Therefore, you can delve into the detail of a hyperlink and later return to the page that refered you there.