Personal data may only be processed if there is a legal basis for it, such as the data subject's consent, the performance of a contract, a legal obligation or a legitimate interest. There are also special categories of personal data, such as data on health, race, political opinions or religion, which are subject to stricter rules. These may only be processed under strict conditions, for example if the data subject has given explicit consent or if the processing is necessary for the exercise of specific employment, social security and social protection rights. Companies should always ensure transparency and security when processing personal data and ensure that data is not kept longer than necessary.