They are necessary for the functioning of the network seat and cannot be switched off. They are typically set in response to User actions that involve a request for services, such as cookie settings, login, or form completion.
They enable anonymous recording of visits and traffic sources, which parts of the network headquarters are more or less visited, the movement of the User around the network headquarters so that we can measure and improve the efficiency of the network headquarters. They do not store personal data directly, but are based on the unique identification of the User's browser and Internet device.