Administrative law governs the creation and operation of executive branch agencies. These agencies, created by Congress, engage in rulemaking and adjudication, exercising discretion while subject to procedural requirements and judicial oversight to protect individual rights and ensure proper authority. The development of administrative agencies spans from the Interstate Commerce Commission in 1887 to the New Deal era's expansion and beyond. The Administrative Procedure Act of 1946 established uniform procedures for agency actions, while recent decades have seen debates over agencies' roles in a changing landscape.