Cookies are commonly referred as messages given to a web browser by a web server. They are used to identify users and prepare customized web pages or save login information for different sites. This is done by storing files on users computers. Cookies hold a certain amount of data for the client or the website to be accessed later. Regarding customization, the page may contain a script which recognizes data stored in the cookie. This allows it to carry information from one web visit to another.