Cookies are often necessary for websites that have huge databases, require login, have custom themes, other advanced features.
Cookies usually contain brief information, address URG website that created it and the duration of the file. Due to the small amount of information in Cookies can not be used to reveal your identity.
There are two types of cookies. Session cookies and persistent cookies. Session cookies are created temporarily in a subfolder of your browser when you visit a website. After leaving the page, the session cookie will be deleted. On the other hand, persistent cookies remain on your browser subfolder and are activated once again to visit the website that created this particular cookie. A persistent cookie remains on your browser in a subfolder of the period set in the browser.