Domain Validated Certificate
For situations where the general public will be visiting a secure section of your site (e.g., making a payment by credit card), you’ll want to utilize a private SSL certificate such as this one. It is directly tied to your domain name, letting customers know they are on the correct website.Private SSL Certificates are appropriate for e-commerce websites and for any situation where you desire secure communication between your website and its visitors.

Company Validated Certificate
A company validated certificate is similar to a domain validated certificate; however, additional documentation must be provided to certify your company’s identity. The biggest advantage of a WHOIS company validated SSL certificate is the way your site is displayed in a browser. More validation means more trust, and your visitors will have more confidence in the security of your site.
Extended Validation Certificates 
EV certificates provide secure connections, verify the business’ identity, and help to prevent fraud through a thorough set of checks and validations.The green HTTPS address bar is exclusive to EV SSL certificates and reassures website visitors that they are interacting with a verified business on a secured domain.

These certificates are designed to provide a higher standard of assurance for visitors to authenticate the business behind the domain.