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What are cookies?

Cookies are just bits of text that web sites pass to your browser to store, either in memory until you close your browser (session cookies), or for a specified length of time on your hard drive. Cookie text is so tiny it has almost no effect on free hard drive space.

Once cookies are stored (in memory or on disk), they are returned to the website that originally stored them whenever you request other documents from that site. This allows the website to "recognize" you based on information you've previously provided. For example, they might store your user ID for the website, your viewing preferences, items in your shopping cart, etc. They are useful because there is no other fool-proof way for a website to immediately recognize your browser when you return later, due to the way the web works.