What is Public-Key and Private-Key Encryption?

Public Key Encryption :

                                                          Public key cryptography is based on the concept of a key pair. Each half of the pair(one key) can encrypt information that only the other half (the other key) can decrypt. One part of the key pair, the private key is known only by the designated owner, the other part, the public key is published widely but is still associated with the owner, key pairs have a unique feature-data encrypted with one key can be decrypted only with the other key in the pair.

Private Key Encryption :

                                                            In Other Words, it makes no difference if you use the private key or public key to encrypt a message, the recipient can use the other key to decrypt it.