Definition
The end-effector is the device attached to the last link of a robot arm. Common types include parallel-jaw grippers (simple, reliable, limited dexterity), vacuum grippers (ideal for flat surfaces), dexterous hands (Allegro, Inspire, LEAP — multi-fingered, high dexterity), and task-specific tools (screwdrivers, welding torches, spray guns). End-effector selection dramatically affects what tasks a robot can perform and what data is meaningful to collect. In research, quick-change adapters allow swapping end-effectors between experiments. Many learning-based manipulation policies are end-effector-specific and need retraining when the gripper changes.
Why It Matters for Robot Teams
Understanding end-effector is essential for teams building real-world robot systems. Whether you are collecting demonstration data, training policies in simulation, or deploying in production, this concept directly affects your workflow and system design.