What is a cookie?
A cookie is a small text file stored on your computer and contains information. Cookies are normally used to improve the website for the visitor. There are two types: a permanent cookie is a file stored on your computer that remains until the duration expires. The file is for instance used for the visitor to more easily use the site based on their preferences and interests. These cookies disappear when the visitor chooses to clear the cookies from its browser. Session cookies are stored temporarily in your computer's memory during the time that the visitor is on a website. They disappear when the user closes their browser.
You can read more about cookies and the Electronic Communications Act on The Swedish Post and Telecom Authority (PTS) website.