What is the different between ETH and ETH2?

Good evening everyone!

I recently bought $1000 of ETH and soon noticed that there was also an ETH2.

So then I wanted to find out – and I apologize if this has already been answered – what is the different between ETH and ETH2?

I am completely new to cryptocurrency’s so please explain it to me as if I have almost no knowledge on the subject (because I don’t).

Also Coinbase (what I am using) says:

Join the wait list for ETH2

Stake your ETH on Coinbase and earn up to 5.00% APR

What does that mean? I am assuming that ETH2 isn’t available yet?