These are those that allow the user to browse through a website, platform or application and use the different options or services that exist on it, including those that are used to allow the management and operation of the website and enable its functions and services, such as, for example, controlling traffic and data communication, identifying the session, accessing parts of restricted access, remembering the elements that make up a reservation, making the booking process, managing payment, controlling fraud linked to the security of the service, counting visits for the purposes of billing licences for the software with which the service works (website, platform or application), using security elements during browsing, storing content for the broadcasting of videos or sound, enabling dynamic content (for example, animated loading of text or images), sharing content through social networks.