Intrinsic motivation means doing something because it makes you feel happy and satisfied inside, rather than because someone else is telling you to do it or giving you a reward for doing it.
Artificial intelligence is when computers and machines can do things that normally require a human brain, like learning and problem-solving.
So when we talk about intrinsic motivation in artificial intelligence, we mean designing machines that can learn and perform tasks because they enjoy doing it and feel a sense of accomplishment, rather than just because they were programmed to do it by humans.
This can be tricky, because machines don't have feelings like humans do. But scientists are working on ways to make artificial intelligence more like human intelligence, including giving them the ability to feel rewarded and satisfied when they do well on a task.
In the future, we might even have robots and machines that are motivated to learn and improve on their own, just like humans are.