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Robots are usually built for a purpose. It'd be easy enough to build a swimming robot, if that was the goal. But a robot built for an entirely other task will probably not be able to swim.
Fictional robots can change into anything the authors want. Real robots have little if any ability to change into anything. They are as they were built and do not change their appearance.
Robots can vary in strength depending on how they are built and with what materials. For instance, a small robot built with aluminum parts may only be able to move a few pounds worth of weight, but a larger robot built with a strong metal such as titanium could move at least hundreds of pounds.
Cartesian robots have cube shaped work envelopes. As their name indicates, the linear movements of Cartesian robots are limited to a grid. Built with three axes of movement (x,y,z), these robots are popular because of their precision.
There are humanoid robots, military robots, insect robots, and space robots. There are more kinds of robots too.