Design and Performance of the ATLAS Muon Trigger System

The ATLAS muon trigger system helps identify proton collision events of interest to both Standard Model measurements and searches for new physics. Composed of both hardware (Level-1) and software (High-Level Trigger) components, the trigger system was successfully optimized during Run 2 to provide high efficiencies while maintaining a sufficiently low trigger rate. These proceedings provide a brief description of the design performance of the ATLAS muon trigger system during Run 2. Several improvements in development for Run 3 are also summarized.