According to RobotWorx, industrial robots are of six main types. The category they belong to depend upon the types of joint, where they are placed, the coordinate system used, motion type, etc.:
- Articulated
- Cartesian
- Cylindrical
- Polar
- SCARA
- Delta
You can find out more about these types of industrial robots and how they are defined here:
https://www.robots.com/faq/show/what-are-the-main-types-of-robots
(pixabay.com)