The digital revolution has led to an increase in platform business models as well as an enhanced use of data and artificial intelligence (AI) across various aspects of life, opening new fields of research in law and economics. This shift raises questions about the functioning of digital business models, competition economics, and antitrust law, with the focus of this contribution being on platform markets, the use of data, and AI algorithms. Examining economic principles is essential to perform both economic and legal assessments. This involves analyzing the mechanisms of platforms and their impact on market dynamics, the role of data as a critical input, potential competitive issues, and the various types of algorithms and their effects on competition.