Persistent cookies are usually used for the services outlined above. Sessional cookies are used to monitor your activities during a single visit to a site. As a result, browser makers have given the user the option of warning about sites that are using cookies. This warning can be enabled, or disabled, by the user. If you do enable cookie warnings be prepared for a lot of interruptions to your web browsing, especially if you refuse each cookie.
Most large sites use cookies for site management.
Some are persistent, and some are sessional. To ease the burden of clicking your button to refuse cookies, several products have been created. There are links to the creators of these products at the bottom of this page. Disabling cookies can have some consequences however. Certain sites require the use of cookies to function at all.