A microsystem refers to a small, immediate environment where individuals interact with others and their surroundings. This concept is often used in fields like psychology and sociology to understand how personal relationships and local settings influence behavior and development. Examples of microsystems include a family, a classroom, or a workplace. In the context of Bronfenbrenner's ecological systems theory, the microsystem is the innermost layer, emphasizing direct interactions. Factors such as family dynamics, peer relationships, and school environment play crucial roles in shaping an individual's experiences and growth within this system.