An SSL certificate is a digital certificate used to encrypt data transmitted by a website and verify the identity of the website. Based on different purposes and verification levels, SSL certificates can be divided into the following types:

　　Domain name verification certificate:

　　Domain name verification certificate is the most common type of SSL certificate, which only needs to verify the ownership of the domain name. Verification is usually done by sending a verification email to the domain name registration email or adding a specific TXT record to the DNS record. Domain name verification certificates are suitable for personal websites, blogs, small businesses, etc.

　　Organization verification certificate:

　　In addition to verifying the ownership of the domain name, the organization verification certificate also needs to verify the organizational information of the certificate applicant. The Certificate Authority (CA) will verify the legality and authenticity of the organization, such as company registration information, business license, etc. Organizational verification certificates are suitable for small and medium-sized businesses and e-commerce websites.

　　Enhanced verification certificate:

　　Enhanced verification certificates provide the highest level of verification and trust, and the verification process is more rigorous and detailed. In addition to verifying domain name and organizational information, the applicant's legal and physical presence also needs to be verified. Enhanced verification certificates display the company name in green in the browser address bar and provide greater trust and visibility. Suitable for large enterprises, financial institutions and e-commerce websites.

　　Wildcard certificate:

　　Wildcard certificate is suitable for websites with multiple subdomains. It can protect the main domain name and all its subdomains. The advantage of a wildcard certificate is that only one certificate is needed to cover multiple subdomains, making it easy to manage and deploy.

　　Multi-domain certificate:

　　A multi-domain certificate (also known as a SAN certificate) can protect multiple different domain names or hostnames in a single certificate. It is suitable for websites that need to protect multiple domain names, such as those of multiple brands, subsidiaries, or related services.

　　The above are common SSL certificate types. Each type has different verification levels and functions, and is suitable for websites of different sizes and needs. Choosing the type of SSL certificate suitable for your website can provide higher security and trust, ensuring the security of user data transmission and the reliability of the website.