How is social secrecy defined? What is social data in detail?

The EU GDPR and Social Data Protection in SGB X

Social secrecy is stipulated in the German Social Code Book I. How is social secrecy defined? What is social data in detail? What is the significance of data protection in general? Present the systematics and principles of social data protection (SGB X). What must be observed under Regulation 2016/679 of the European Parliament and of the Council of 27 April 2016 on the protection of individuals with regard to the processing of personal data and on the free movement of such data? What legal provisions govern the transfer or disclosure of social data to third parties?