Cookies are small files can be saved to and read from your computer by any website you visit on the internet. They are one of the only reliable ways that a website can persistently identify you (or your session). This means that when you visit a particular website, the cookies you have saved for that website are automatically sent to the website with each request.
They are used for a variety of purposes, from allowing website owners to see how their users use their websites, to saving user preferences, remembering a user is logged in, or delivering targeted advertising.
The following links provide an overview how to manage cookies in the five most popular desktop web browsers: