SSL certificates provide encryption, authentication, and trust protection for websites, and establish a safe and reliable connection for users and website owners. SSL certificates can be mainly divided into the following categories:

Domain Validated Certificate (Domain Validated, DV):

This is the most common type of SSL certificate. The domain name verification certificate only verifies whether the domain name of the website is valid, and does not verify the identity information of the enterprise or organization. This type of certificate is issued quickly and at a low cost, and is suitable for personal websites, blogs, small businesses, etc.

Organization Validated Certificate (Organization Validated, OV):

Organizational verification certificates perform stricter verification of websites. A certificate authority (CA) verifies the legitimacy and identity information of the organization to which the website belongs, including the organization's name, address, and phone number. OV certificates can provide higher trust and security, and are suitable for small and medium-sized enterprises and e-commerce websites.

Extended Validation Certificate (Extended Validation, EV):

Extended validation certificates are the highest level of SSL certificates. The CA performs exhaustive verification of the website's organizational identity and displays a green address bar on the browser address bar to highlight the website's identity. EV certificates provide the highest level of trust and security and are suitable for banks, financial institutions, e-commerce sites, and more.

Wildcard Certificate:

Wildcard certificates can be used to protect multiple subdomains under the same domain name. For example, if your website has multiple subdomains (such as www.example.com, blog.example.com, shop.example.com), you can use a wildcard certificate to cover all of these subdomains without having to create a separate certificate for each subdomain. Purchase a certificate.

Multi-Domain Certificate:

Multi-domain certificates are also called SAN certificates (Subject Alternative Name). It allows multiple different domain names to be secured in a single certificate, including the main domain name and other domain names or subdomains. Multi-domain certificates are ideal for businesses, organizations or individuals who need to secure multiple domain names.

The above are the main categories of SSL certificates. It is very important to choose the type of certificate that suits your website needs and security requirements, and can be selected based on factors such as website size, security needs, and budget.