Actuators are a subcategory of executive components that convert electrical, pneumatic, or hydraulic energy into motion, force, or torque. In robotics, actuators form the basis of joints, grippers, manipulators, mobile drives, and other motion systems. The category encompasses linear actuators, rotary actuators, and more complex drive modules used in industrial, mobile, and humanoid robots.

An Arm Link is a mechanical segment of a robot arm situated between joints or attachment points. Its function is to transmit forces, torques, and working loads while defining the geometry and reach of the arm. In robotics, Arm Link elements are critical to manipulator kinematics, structural rigidity, and motion precision. They may be fabricated from aluminum, composites, steel, or engineering plastics, depending on mass and strength requirements.

Integrated Module is a hardware design class for components that are built into a larger system and operate as an integral part of it, rather than as independent external devices. Such a component is typically designed specifically for a given platform or robot model, interfacing directly with its electronics, power supply, and communication buses, and serving a defined internal function — such as audio input, perception, communication, control, or safety. This class includes integrated microphone arrays, IMU modules, embedded cameras, communication modules, control boards, sensor modules, and other subassemblies mounted within the robot's structure.