What is SSL Certificate?

When you submit a form, log in, or make a purchase on a website, your data travels over the internet as it moves between your browser and the server. Without SSL, that data travels in plain text — readable by anyone intercepting the connection. SSL (Secure Sockets Layer — now technically replaced by TLS, Transport Layer Security) creates an encrypted tunnel so intercepted data appears as random characters.

Visually, SSL is indicated by "https://" in the URL and a padlock icon in the browser address bar. Browsers like Chrome actively warn users when they visit an unencrypted HTTP site — a "Not Secure" label that severely erodes trust and increases bounce rates. Google confirmed HTTPS as a ranking signal in 2014 and has progressively increased its weight since.

SSL certificates are issued by Certificate Authorities (CAs). Free certificates via Let's Encrypt are available for most sites and are sufficient for small businesses. Extended Validation (EV) certificates, which show the company name in the address bar, are typically used by financial institutions and large e-commerce sites for additional trust signaling.