Cookies are small text files that the sites visited by the user sends to the device (usually the browser), they are stored in the corresponding folder of the browser as the user's intention to visit a website, and then be retransmitted to the same sites to visits. Are used in order to improve navigation, (http protocol is stateless and can not "remember" the authenticated user who turns the pages), save user preferences already included (username, password, etc.), track and tastes user preferences allowing you to manage the presence or absence of targeted marketing initiatives or the provision of services related to the activity of the Holder as a newsletter, etc. If it were placed limitations on usage this will definitely impact on the state of the user during the consultation. Blocking or removing them browser cache, could result in an incomplete use of the services offered by the application web.
Google Analytics is a service offered by Google that generates detailed statistics on traffic of a website and traffic sources. It is the most used service statistics. Google Analytics can track visitors from all external links to the site, including search engines and social networks, direct visits and reference sites. It also displays advertising, pay per click, email marketing and also links within PDF documents. For more information: http://www.google.it/analytics/learn/privacy.html