Secure Sockets Layer — the technology that encrypts data between a user's browser and your server (the 'S' in HTTPS).
SSL (or its modern successor TLS) is encryption technology for internet communication. When you see "https://" in a URL, SSL is protecting the connection. Your browser and server exchange encryption keys using RSA or similar algorithms, then all data between them is encrypted. Eavesdroppers can't read it.
SSL certificates prove your domain is authentic — the certificate authority verifies you own the domain before issuing one. CDNs and hosting platforms provide free SSL certificates automatically (like Let's Encrypt).
SSL protects API keys, JWTs, tokens, passwords, and personal data in transit. HTTPS is HTTP with SSL/TLS encryption. Without SSL, anyone on the same network could intercept your data. Always ensure your deployed app uses HTTPS.
An SSL Certificate is the digital credential that enables SSL/TLS encryption on a website, shown as the padlock icon in the browser.
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