The document discusses end effectors, which are tools attached to robot wrists that allow robots to perform tasks. It describes several common types of end effectors, including grippers, tools, and sensors. It provides examples such as grippers, presses, guns, and deburring tools. It then focuses on different types of grippers, grouping them into mechanical, vacuum, magnetic, and adhesive grippers. For each type, it provides brief details about their applications, advantages, and disadvantages. Pneumatic, hydraulic, electric, and mechanical grippers are also compared based on their power sources and characteristics.