Cookies are used to store information or record one's activities on a website. It is the file sent by the web server to web browser and it is stored on the client's computer. It is basically used to store visitor preferences for a specific site. When the site is visited after being sent the cookie, the site may show specific pages according to the information stored in the cookie. Although cookies have many benefits, but some people don't like to have their information stored by the websites, So most of the browsers have an option through which you can turn the cookies on and off. It seems like everyone who tries to explain what a cookie is just has to make a joke out of it (because of the name), so I'm not even going to bother. In computer terminology, a cookie is data sent to your computer by a Web server that records your actions on a certain Web site. It's a lot like a preference file for a typical computer program. When you visit the site after being sent the cookie, the site will load certain pages according to the information stored in the cookie. Most cookies have an expiration date. One more fact, cookies can not read information stored in your computer.