An SSL certificate is a small data file that enables encrypted HTTPS connection between your website and its visitors. Without it, browsers mark a site as "Not Secure", data travels unencrypted, and search engines like Google rank the site lower — HTTPS has been a confirmed ranking factor since 2014.

All certificates differ mainly in validation level — how thoroughly the certificate authority checks who's behind the domain before issuing it. DV (Domain Validation) only confirms you control the domain — issued automatically in minutes, perfect for blogs, landing pages and personal projects. OV (Organization Validation) additionally verifies that your registered company actually exists, adding a layer of trust for business websites. EV (Extended Validation) performs the most rigorous legal and operational check — the standard for banks, payment systems and eCommerce platforms that handle sensitive financial data.

Beyond validation level, certificates also differ in coverage. A Wildcard SSL secures one main domain plus an unlimited number of its subdomains (*.example.com) — ideal for SaaS platforms and multi-service projects. A Multi-Domain SSL (SAN/UCC) instead covers several completely different domain names under one certificate — a practical choice for agencies managing many client sites. And if you're not securing a website at all but distributing downloadable software, Code Signing SSL digitally signs your applications so operating systems trust your publisher instead of showing security warnings.