Bronfenbrenner's Ecological Systems Theory explains how different environments influence human development. It consists of five layers: the microsystem, which includes immediate settings like family and school; the mesosystem, which connects these settings; the exosystem, which involves external environments that indirectly affect the individual; the macrosystem, which encompasses cultural and societal influences; and the chronosystem, which considers changes over time. This theory emphasizes that development is not just influenced by individual factors but also by the complex interactions between various systems. Understanding these layers helps in recognizing how different contexts, such as community and policy, shape a person's growth and experiences.