What does asking for help even do?

Like I've heard people talking about how asking for help is the hardest thing for people to do and stuff. But what does it even do. Asking for help isn't gonna make them somehow magically have a solution to your problem. Also people have their own problems to deal with, so why would anyone want to deal with someone else's problems. So what exactly is asking for help doing. It isn't helping you and it's hurting others, so why would anyone even do it?