There are several types of SSL certificates available depending on the requirements of the website or application. The main types of SSL certificates are:

1. Domain Validation (DV) SSL certificate: This is the simplest type of SSL certificate and only provides domain validation. This means that the certificate authority only verifies that the requester has the right to manage the domain. DV SSL certificates are generally most suitable for simple websites and blogs.

2. Organization Validation (OV) SSL certificate: This type of SSL certificate provides organization validation, meaning that the certificate authority verifies that the company requesting the certificate is a legitimate and registered entity. OV SSL certificates are usually suitable for companies and organizations that conduct online transactions.

3. Extended Validation (EV) SSL certificate: This type of SSL certificate provides the highest level of validation and verification, with the certificate authority conducting thorough checks on the company before issuing the certificate. EV SSL certificates are used by websites and companies that want to provide the highest level of security and trust to their customers, such as banks and e-commerce sites.

4. Wildcard SSL certificate: This type of SSL certificate is designed for websites that have multiple subdomains under one main domain. With a wildcard SSL certificate, you can secure an unlimited number of subdomains with one certificate.

5. Multi-Domain SSL certificate (also known as SAN certificate): This type of SSL certificate is designed for websites that have multiple domain names or subdomains. With a Multi-Domain SSL certificate, you can secure multiple domain names and subdomains with one certificate.