A gripper is a device which enables the holding of an object to be manipulated. The easier way to describe a gripper is to think of the human hand. Just like a hand, a gripper enables holding, tightening, handling and releasing of an object. A gripper is just one component of an automated system
A robotic tool changer is a coupling device that allows a robot to drop off and pick up different end effectors. It can be pneumatic or electric.
An external axis is a vertical or horizontal positioning system for Robot operating range extension
A feeder is one of the most commonly used means of presenting parts, ready for picking in a very short time in robotics applications
The frame on which the robot is installed
If external cables are used on your robot they need to be routed on the robot arm. On top it is good to protect your cables especially for friction and environmental influence. To do this a cable protection is a good solution.