This article will explain about cookies and how to use Cookies in your ASP.NET applications. As we all know that cookies is very popular and being used by almost all websites in the world to track user information such as logon details, length of visit, number of visits and etc. A cookie is a small text file that the browser creates and stores on the hard drive of your machine. Cookie is just one or more pieces of information stored as text strings. A Web server sends you a cookie and the browser stores it. The browser then returns the cookie to the server the next time the page is referenced.