Bronfenbrenner's ecological model views human development as influenced by different environmental systems, with the microsystem (immediate environment such as home/school) having the most direct impact and the macrosystem (overarching culture/ideologies) having the most indirect impact. The model conceptualizes four types of nested environmental systems - the microsystem, mesosystem, exosystem, and macrosystem - that help explain how various influences in a child's surroundings affect how they grow and develop from a young age.