Extended Validation (EV) certificates are single-domain SSL (Secure Sockets Layer) certificates that offer the highest degree of authentication and SSL protection. To ensure this, they require more evaluation and documentation checks for applicant websites than other certificate types. DigiCert EV SSL certificates include a manual validation step to confirm: The legal, physical, and operational existence of the entity
That the entity has properly authorized the issuance of the certificate
That the entity has exclusive right to use the domain specified
The identity of the entity matches official records