International university rankings are increasingly used by various stakeholders to compare higher education institutions, though they are also subject to criticism. This document provides an overview of some of the most prominent international rankings, including the THE, QS, Shanghai, and Leiden rankings. It discusses the methodology, indicators, and criticisms of each. The document also examines the positioning of Dutch universities like TU Delft in these various rankings and notes some new initiatives to improve rankings, such as U-Multirank, that aim to be more multi-dimensional and personalized.