What distinguishes the star count of an open cluster from a globular cluster?

Answer

Open clusters hold hundreds to thousands while globular clusters hold millions

The scale of these two cosmic structures is vastly different. Open clusters are characterized by a relatively modest number of stars, typically ranging from a few hundred to a few thousand. In contrast, globular clusters are immense stellar systems that contain hundreds of thousands to millions of stars, all bound together in a compact, spherical configuration.

What distinguishes the star count of an open cluster from a globular cluster?
clusterstarObjectaggregation