A "cookie"
is a small piece of information which can be stored
on a user's computer, that will be replayed back to you
each time they visit your page.
This is useful for having the browser remember some specific
information across several pages; for example, when you browse through
a "virtual shopping mall" and add items to your "shopping cart" as you
browse, a list of the items you've picked up could be stored
in a cookie kept track of by your browser in a "cookie" file.
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