Administrative law is the branch of law dealing with government agencies.
Administrative law is created by administrative agencies, rather than traditional legislative or judical bodies. This agency-created law is typically promulgated by state and federal agencies in carrying out their official duties.
Administrative law often fills in the details omitted from broad or general laws enacted by legislative bodies. Indeed, much of administrative law involves agency policies enacted to carryout legislative directives.
Administrative law focuses on the power (or lack thereof) to make rules, to decide facts and the application of law, and how and when to undertake specific regulatory enforcement actions.
Examples of agencies that create administrative law include large bureaucratic agencies, such as the U.S. Department of Treasury and Internal Revenue Service, and smaller agencies such as the Texas Railroad Commission.
Administrative law has grown in importance as Congress has taken a hands off approach to enacting and enforcing legislation.