This document provides an introduction and overview of mechatronics systems. It discusses the synergistic combination of mechanical, electrical, and computer engineering that characterizes mechatronics. Examples of mechatronic applications are then given across several fields, including manufacturing, transportation, robotics, medical, defense, sanitation, and smart home applications. Specific systems highlighted include CNC machines, automobiles, high speed trains, Segway personal transporters, Mars rovers, pacemakers, unmanned aerial vehicles, soap and paper towel dispensers, washing machines, and smoke detectors.