OV and EV-type SSL certificates have the basic verification process as DV certificates. However, in addition to validating your domain, these two types of domains require additional steps before being signed and approved by the certificate authorities (CA).
Organization Validated Certificates (OV) are often needed for business and public websites that collect and store customer information (e.g., web apps). In addition to validating your domain through the regular verification process, the CA verifies your business by getting in touch with you or your business. The CA checks to see if you own the domain and if it is for a business registered with the government. These certificates are thought to be very trustworthy.
Extended Validation certificates (EV SSL) Like DV and OV validation procedures, you will need valid proof that your business has been open for over three years + third-party business directory verification. Most businesses prefer EV certificates as they are known for their trust and reliability. The CA has very strict rules when reviewing these requests which means that your business is fully checked out. EV certificates are expensive and require a long verification process. Because of this, they are mostly used by well-known websites that ask visitors for personal information or often collect online payments (e.g., banks or medical providers).