How do they work
The site then ’knows’ that you have been there before, and in some cases, tailors what pops up on screen to take account of that fact. For instance, it can be helpful to vary content according to whether this is your first ever visit to a site – or your 79th.
What are cookies
Cookies are NOT programs, they do not do anything at all. All they are is text files. They contain 2 things: a site name and unique user ID.