CSES (https://cses.org) is the largest network of electoral studies in the world, aggregating European, American, Asian and African post-electoral surveys. Based in Michigan, USA, CSES was founded in 2001. Since its foundation, six questionnaires have been released, which on average have been implemented in around forty countries each, allowing for a better understanding of how people vote today. Each questionnaire includes central questions that remain unchanged, and thematic questions which vary. The creation of this set of integrated datasets gave rise to a large number of publications.