A mobile robot refers to a type of robot that has the capability to move or navigate in its environment. Unlike stationary robots that are fixed in one place, mobile robots are designed to be autonomous or semi-autonomous, enabling them to travel and operate in various locations. They typically incorporate locomotion mechanisms such as wheels, tracks, or legs to move around.

Overall, the primary characteristic of a mobile robot is its ability to move and operate independently, allowing it to perform tasks in dynamic and unstructured environments.