A cookie is a file that is downloaded to your computer to access certain web pages. Cookies allow, among other things, record user activity anonymous to the website, allowing remember certain settings and information about the user in order to have a more personalized web site, set preferences, and data analysis.
Third-party cookies providers are:
(Third-party cookies are those that are sent to the user's terminal equipment from a machine or domain that is not managed by the publisher, but by another entity that processes data obtained from cookies)
Two cookies (PREF & NID) persistent set by Google Maps applications and managed by Google.
The Website may use information about your visits to conduct assessments and statistical calculations on anonymous data, and to ensure the continuity of service or to make improvements to their websites.
In the following links explains cookies management for different web browsers:
Safari, from http://support.apple.com/kb/ph5042
You can extend more information about cookies at the following links: