The Secure Sockets Layer, also known as SSL. You can recognize a Secure Sockets Layer by its web address prefix, “https.”
The SSL makes use of cryptographic encryption of data sent to and from your website. In this way the SSL keeps malicious outsiders from decrypting the sensitive information. Your customers feel secure because they know that their information has been transmitted over the Internet with all precautions taken.
To use “https”, you are required to have an SSL certificate. The certificate is actually special data identifying your server and informing Internet browsers how to encrypt the data that is sent to it.