Abstract
The ongoing digital transformation brings about new risks for the people using information society services and for societies as a whole. In view of these challenges, a new legal framework is being established in the European Union to ensure proper functioning of the online environment and adequate protection of fundamental rights. The Digital Services Act (DSA) is intended by the European legislator to achieve this objective. The article is aimed to describe the key obligations of providers of intermediary services related to ensuring transparency of algorithmic personal data processing arising from the provisions of the DSA. The author also analyses the interplay between t the DSA and the GDPR in an attempt to clarify potential uncertainties.