Domain Validated (DV): Quick validation by verifying domain ownership only. Ideal for personal projects and small businesses. Organization Validated (OV): In addition to domain verification, verifies the legal entity of the organization. Displays company details in the certificate. Extended Validation (EV): The strictest validation process, including thorough vetting of company documents. Results in a green address bar, indicating higher trust. WildCard SSL: Covers all subdomains at one level (e.g., *.example.com) under a single certificate. Multi-Domain (SAN/UCC): Secures multiple distinct domains or subdomains within one certificate (e.g., example.com, another.com, sub.example.com).