An industrial robot is typically a robotic arm — operating on three or more axes — that can be programmed to take over easy but boring tasks like picking up an object and placing it somewhere else.
Microrobotics is an all-encompassing term covering the development of small robots. Microrobots typically measure less than 1 millimeter, though sizing can vary based on researcher and use case.
Cobots, or collaborative robots, are robots that work safely alongside humans. They are often designed to take on menial, repetitive tasks, freeing up humans to focus on more important, and enjoyable, aspects of their jobs.