Stellar associations are groups of stars that share a common origin and are located relatively close to each other in space. These stars are typically young, often less than a few million years old, and are loosely bound by their mutual gravitational attraction. They can be found in regions of active star formation, such as molecular clouds, where new stars are born. Unlike star clusters, which are tightly packed and gravitationally bound, stellar associations are more dispersed. They can contain a few to several hundred stars and are often categorized into two types: OB associations, which are composed mainly of massive, hot stars, and T associations, which include younger, cooler stars.