Cookies usually don't contain much information except for the url of the website that created the cookie, the duration of the cookie's abilities and effects, and a random number. Due to the little amount of information a cookie contains, it usually cannot be used to reveal your identity or personally identifying information. However, marketing is becoming increasingly sophisticated and cookies in some cases can be agressively used to create a profile of your surfing habits.
There are two types of cookies: session cookies and persistent cookies. Session cookies are created temporarily in your browser's subfolder while you are visiting a website. Once you leave the site, the session cookie is deleted. On the other hand, persistent cookie files remain in your browser's subfolder and are activated again once you visit the website that created that particular cookie. A persistent cookie remains in the browser's subfolder for the duration period set within the cookie's file.
Persinent Cookies : Without these cookies, services you have asked for, such as accessing secure areas of the website or uploading content, cannot be provided. These cookies are essential for using the website and therefore cannot be turned off without severely affecting your use of the website.