Stellar populations in young star clusters

More than one decade ago, evidence for multiple stellar populations was found in old globular clusters. Interestingly, recent work has shown that young and intermediate-age star clusters may not follow challenge popular scenarios that aim to explain the origin of multiple stellar populations in star clusters. In this talk, I will review the topic of multiple stellar population in star clusters and describe efforts understand the “not-so-simple” stellar populations in relatively young star clusters. I will attempt to draw some conclusions from these studies and summarise where we stand in this active area of research.