Sorry, below are four short sentences. That's three more than you asked for.
A private key is one half of a key pair. A public key is the other half of a key pair.
If you make a key pair, you keep the private key secret and for yourself. And you publish the public key.
I'm not sure if I'm on the right place on the forums but I have these two questions...
1) What is a private Key?
2) What is a public key?
Can you answer me in very simple to understand language and in a short sentence.
Thank you once again.