What is energy?

Listening to this after feeling some negative energy in the room. 

There's something about it that's making me feel a little better. 

Do you feel energy around us? 

Sometimes we go to a place and we feel like we'd like to get out of that space.

Other times, we want to linger longer because the space made us feel so welcomed and happy. 

Same with people, some give us bad vibes and some people we want to keep hanging out with. 

Why is that? 

Do we have possess unique energies then?

Can we change our energies? 

So many questions which I hope I can get an answer to someday.

What do you know about energy?