End effectors are the functional unit that is attached to the flange of each robot and with which the movement to be automated is executed. The functional unit can be either a gripper, a workpiece or measuring/testing equipment. This is how Andreas Pott and Thomas Dietz define it in their book Industrielle Robotik, Springer Verlag.
At times, robots perform handling or pick-and-place tasks to a large extent in an industrial context. Mostly, therefore, robot grippers are used for end effectors.
At RBTX, you can perform a compatibility check before you buy an end effector. To do this, simply place the robot you are using and your preferred end effector in the MyRobot configurator. The configurator will then tell you if your products are compatible.