Energy comes in numerous forms such as heat, light, electricity and the ability to do work. Energy is matter.
Energy is everything, the ultimate, irreducible essence of the universe.
Of course it does. Energy grows food and keeps people alive. It transports us, fuels machines and keeps the world economy going. Modern industrial societies are built on natural fossil fuels which provide energy such as coal, oil and gas. We must continue to supply ourselves with this valuble resource if we are to survive and prosper.