Session cookies to facilitate user navigation and remember where the user is when browsing a website, not having websites memory where surfing, acting these cookies as a marker within the website. These cookies once the browsing session or disappear.
Cookies for authentication as a registered user to log on to the pages that require identification / authentication. These cookies are necessary to access the services or content restricted to users identified and authenticated.
Cookies meter (Google, Nielsen, Comscore, Weborama, etc.). These cookies are used to analyze the visits made, places and times navigating the website. The cookie information is transmitted and stored directly by the meters on their servers, which can be located in a country with not comparable to that of the country of the owner of this site protection. These meters will transmit this information to third parties cookies when required by legislation, and use it to provide services to users.
Staying on the web more than 15 seconds
Scroll vertically through the web.
Click any point or web link
Also note that you can set your browser to refuse to accept cookies, or set your browser so that these cookies are deleted automatically once the browser, computer or device is closed. The cookie settings in browsers is performed:
Google Chrome Settings> Privacy> Content Settings> Cookies
Firefox Preferences> Privacy.
Internet Explorer Tools> Internet Options> Privacy> Advanced.
Safari Preferences> Privacy.