Data protection is intended to protect the personal data of individuals from unauthorized and improper use.
This so-called "personal data," i.e., information that makes a person directly or indirectly identifiable, includes, for example, data such as full name, date of birth, address or telephone number. Particularly sensitive personal data (e.g., health, origin, political orientation, religion, etc.) belong to the special categories of personal data and are thus given special protection.
In Germany, the legal basis for data protection is provided by the General Data Protection Regulation (GDPR) and the Federal Data Protection Act (BDSG), among others.
By the way: The EU General Data Protection Regulation (GDPR) does not apply in the EU, but to everyone who process data of EU citizens. A significant difference!