Bored from what?

Why we get bored?
When we get bored?
How we get bored?
What is getting bored?
Why it is something we want to avoid?

As humans we cannot maintain a steady interest in something that is not surprising us. We tend to get bored when we are alone, and there is no one to talk to. We tend to get bored when we are in middle of other humans, but what they talk about is very un-interesting. We tend to get bored with the same food menu everyday again and again. We tend to get bored with work if there is no challenge or no element of excitement.