Ecological Systems Theory, developed by Urie Bronfenbrenner, explains how different environmental systems influence human development. It identifies five levels of influence: the microsystem (immediate environment), mesosystem (interconnections between microsystems), exosystem (indirect influences), macrosystem (cultural and societal factors), and chronosystem (changes over time). Each level interacts with the others, shaping an individual's experiences and growth. This theory emphasizes that development is not just a result of individual traits but also the complex interplay of various systems. By understanding these layers, researchers and practitioners can better address the needs of individuals within their broader contexts.