A cookie is a small piece of data sent from a website and stored in a user's web browser while the user is browsing that website. Every time the user loads the website, the browser sends the cookie back to the server to notify the website of the user's previous activity ( Wikipedia ).
More about cookies:
How to block and delete cookies
As a general rule, all web browsers have several configuration options for managing cookies that allow the user to choose different privacy levels in a way that, for example, all cookies sent by a website like this are refused, or even to delete all cookies that could have been saved. To modify these parameters, consult the help files of your web browser or request more information to its developers.
If the user restricts or blocks some or all the cookies on this website, some functionalities or services of the website might not been available.
Cookies used by Museo Reina Sofía
All cookies from this website are associated only to an anonymous user and his/her computer, they never provide or gather information that allows to obtain personal details of the user.
Google Analytics cookies (__utma, __utmb, __utmc, __utmz)
These four cookies provided by Google Analytics gather data about the navigational activity of the user through the website — data as the location of the user or details about the visit (time, visited pages, etc.). Besides blocking these cookies using the web browser options, the user can use this complement provided by Google to disable Google Analytics during his/her visit.
Technical cookies from the web platform (PHPSESSID, cookie-agreed-es, has_js)
These cookies used by the web page allow the visit to the page.
Cookies Vimeo (a, ab_psb, aka_debug)
Vimeo cookies are present on pages that use videos from Vimeo and are used for viewing videos.
Twitter cookie (guest_id)
Twitter cookies is only used on the pages that include a “Tweet” button, its aim is to identify the user with an unique number associated to Twitter.
Facebook Cookies (c_user, csm, datr, fr, lu, s, xs)
Facebook cookies are present on pages that include the Facebook "Like" button and are used for identifying users.
Google Cookies (APISID, BEAT, HSID, NID, OTZ, PREF, SAPISID, SID, SSID)
Google cookies are inserted by Google on pages than include the "G+" button and are used for identifying Google+ users.