What are SSH keys ?

SSH keys are used to login to a remote server with SSH.

It is more secure way than using a password, as passwords can be cracked.

When you generate a key pair , it provides you with two long string of characters :

•  A public key : Place public key on the server
•  A private key : Unlock public key from a client that already has the private key

When public key on server matches with the private key on client, system unlocks it without the password.

You can protect the private key with a passphrase.