Time Machine

What is it?

It's a backup program. Yeah. It's a backup program. That's all I know about it. What makes it different? Is it the integration, the fluidity? What is it?

How do I use it?

Do I just connect a hard drive? I heard it's automatic. Should I make a new partition, or can it share space with my other content on my hard drive?

What can I do with it?

Does it just back my stuff up or is there more to is?