GitHub question

[AnunnakiKungFu]

I didn't see a specific section for this question, I think. Before I ask, please know that I am new to programming, I am not the smartest person in the world but I am trying my best. I've been reading about GitHub but I can't exactly understand what it's for. Is it a code sharing website that you can store your own code on? Like, people can see it and critique it?

Thank you guys for the help!