Robots are useful in industry for a variety of reasons.
In today's economy, a business needs to be efficient to keep up with the competition. Installing robots is often a way business owners can be more competitive, because robots can do some things more efficiently than people. When the task required would be dangerous for a person, they can be do the work instead. Robots don't get bored, so work that is repetitive and unrewarding is no problem for a robot. Robots have changed the way people work.