Domain validation (DV) is the simplest type of SSL certification. This certificate variant provides confirmation that the domain has been registered and the certificate request has been approved by a person with administrative authority.
Organization validation (OV) meets more validation requirements than domain validation. It authenticates the domain ownership as well as the company information (name, city and country) contained in the certificate.
Extended validation (EV) represents the highest authentication standard. The validation criteria are defined by the CA/Browser Forum and reviewed annually by KPMG. EV triggers the green address bar in the web browser and displays the company name and certification authority.