Forum Moderators: mack
Cookies are small files that a domain can place on in the browser area of your computer so that when you return to their domain they can see something about your earlier visit -- many kinds of details are possible that the site wants to program.
For instance, here on WebmasterWorld, a red ball icon shows next to a new thread. If you click on the "reset last read pointers" link at the top right of the page, then your cookie is changed so that when you return to that forum, only those threads with new posts are marked with the icon. And they will stay in place until you reset again.
In some cases, the cookie will help you return to a shopping cart that you left an item in, or remember what your language or monetary unit preference is and so on.
Cookies are money to webmasters.
They have other uses, tracking for instance.
Remember Hansel & Gretel when they went
down to the woods,, and left a trail of cookies,
so see were they had been. Same thing