SSL certificates are the standard for securing your website. SSL
is a transparent protocol, which requires little interaction
from the end user when establishing a secure session. For
example, in the case of a browser, users are alerted to the
presence of SSL when the browser displays a padlock, or in the
case of Extended Validation SSL the address bar displays both a
padlock and a green bar. This is the key to the success of SSL –
it is incredibly simple experience for end users. As opposed to
HTTP URLs which begin with "http://" and use port 80 by default,
HTTPS URLs begin with "https://" and use port 443 by default.
HTTP is insecure and is subject to eavesdropping attacks which,
if critical information like credit card details and account
logins is transmitted and picked up, can let attackers gain
access to online accounts and sensitive information. Ensuring
data is either sent or posted through the browser using HTTPS,
such information is encrypted and secure.