What do cookies mean?
Cookies are small files which are stored on your computer. They are created to hold a small amount of data which is specific to a particular website, such as a username and password which would allow for easy log in to a particular website.
This is just one example of what cookies can be used for. Their main purpose is to help make your online experience better.
If you wish to delete your cookie data, you can do this by going into your browser settings, as each browser is different you want to be looking for your history. Here you can remove all of your browsing history, cookies or both.