When  you browse various web pages ,to view those sites very those files are saved as cache or temporary Internet Files. 

If you don’t want others to see this information you can delete these cookies ,cache from your IE,Firefox.

Deleting Cookies from IE

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1.Open Internet Explorer,Click on Tools 

2.Select Internet Options  on the General tab in the Temporary Internet Files section click Delete Cookies.

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3.Click O.K.

Note:IE used here is IE6.0

Deleting Cookies from Firefox

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1.Open Firefox and Click on Tools

2.Select options on the  options window Select Privacy

3.On the Cookies Click Show Cookies

Click Remove all cookies or remove Cookies you like .

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4.You can remove selected cookies also .

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Note :Firefox used here is Firefox2.0