The concept of cookies was introduced for the first time in 1994 in the Mosaic Netscape web browser. A year later, this concept was introduced in Internet Explorer. From that time, the idea of tracking contents of shopping cart baskets across browser sessions remains relevant until today. So, what problem do cookies solve?

An HTTP protocol is stateless and doesn't allow the server to remember the request later. Because it was not designed to be stateful, each request is distinct and individual. This simplifies contracts and minimizes the amount of data transferred between the client and the server. In order to have stateful communication between web browsers, you need to provide an area in their subdirectories where the state information can be stored and accessed. The area and the information stored in this area is called a cookie. Cookies contain the following data: