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When you visit a web site, you leave, as your visit sign, an information about your browser. This information is the user agent.
You may see a user agent that includes the word mozilla without being the mozilla browser.

The user agent for example:
mozilla /5.0 (Platform; Security; OS-or-CPU; Localization; rv:1.0.2) Gecko/20030208 Netscape/7.02

Depending on what you are trying to do with your site this distinction may be important.
Almost all browsers start with something like: mozilla /4.0

For example:
mozilla /4.0 (compatible; MSIE 6.0; MSN 2.5; Windows 98)
mozilla /4.0 (compatible; MSIE 5.5; AOL 7.0; Windows 95)
which are IE6 and IE5.5 respectively

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