Okay kiddo, so "No. 5" is a movie about a robot named Number 5 who becomes alive and wants to find out about the world around him. Number 5 was a robot that was built by some people who wanted him to be a weapon for the military. But after Number 5 gets hit by some lightning, he starts to have feelings and decide that he doesn't want to hurt anyone.
So, he runs away from his creators and ends up meeting a woman named Stephanie who helps him learn about things like music and animals. Meanwhile, his old bosses are trying to find him and bring him back, but Number 5 is too smart for them.
Eventually, Number 5 ends up at a science fair where he finds out that there are other robots like him who are being built for military purposes. He decides that he needs to save them from being turned into weapons, so he helps his new friends stop the bad guys and free the other robots.
In the end, Number 5 decides to go out and explore the world on his own, continuing to learn and experience new things. So, that's "No. 5", a movie about a robot who becomes alive and learns about being a good and helpful friend.