An Auto SSL Certificate is a new feature available with cPanel for free to make website safer. This SSL is automatically given with a hosting plan. The Auto SSL Certificate is actually issued from cPanel via Comodo certificate authority. This SSL is available for every cPanel and WHM user. Once you enable this domain validated AutoSSL, your websites are automatically secured with a free. however not all hosting platforms offers AutoSSL
Regular SSL Certificate
Regular SSL or Paid SSL Certificate provide the same encryption as Auto SSL but it comes with additional features like warranty, unlimited free reissue, wildcard support, OV and EV feature and more. You can get a regular SSL for 1, 2 and 3 years of validity where an Auto SSL available for 1 year only.