Cookies are: Strings of text, pieces of information stored in files that Web servers store on your computer when you are browsing. These files let the same servers recognize your computer the next time you visit their sites.
Cookies are not: Viruses. They cannot cause direct damage to your computer system in any way, but they can record your browsing habits in intrusive manners and trace your movements across different Web sites.
Some sites use cookies to store your user name, which means, for example, that for 10 hours after you log in with your password, you will not have to retype your password when you check your e-mail. This is a convenience, but it can also be a security hazard if others have access to the computer you are using.
Another use of cookies is to store information about the pages in a site that you have visited previously. This allows a Web site to customize itself with fresh content, rather than showing you the old material, and to present you with content you might be interested in based on what you have already viewed on the site.
Note that the "Use cookies to trace password-protected pages" option in the privacy preferences does not affect Internet activity, it merely uses the cookies saved to remove password-protected pages from your cache, and is thus mainly of interest if you are using Opera with a shared user account.
Invalid cookies
There are types of cookies that Opera will refuse regardless of whether you have set the browser up to handle all cookies. These are cookies set for top-level domains: domains ending in .com, .net, and .org, among others. Such cookies are considered invalid or illegal and are blocked because:
· Any Web site could read such a cookie's contents, it would have unlimited access.
· The only use for such cookies is to track surfers across the Web.
Opera will not let you accept these cookies.
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