The basic function of a Web browser is to serve as a doorway into the World Wide Web. The Web browser receives requests from you, the user, and then sends them on to server machines on the Internet which contain the information you requested. In order for the Web browser to do this, you need to type a universal resource locator, URL, or address into the address location field which is usually found at the top of the screen. The Web browser then retrieves the requested page and displays it on your monitor. Web browsers in the past were mostly limited to displaying text only. However, with the advent of the Mosaic® browser, a graphical user interface browser, both graphics and text display capability have become a customary feature of Web browsers. In fact, most modern browsers are capable of extending beyond simply graphics and text; many are capable of running multimedia features such as sound and video. Sometimes, browsers require plug-ins, or small software upgrades, to allow video and sound files to be accessed. Another convenient feature of browsers is the ability to bookmark your favorite sites. That is, instead of repeatedly typing in the URL, you only click on the bookmark that has the address recorded. This is handy for the Web sites you visit frequently.
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