An SSL certificate is what gives websites the secure HTTPS lock symbol in your browser’s address bar. It encrypts data between your browser and the server. Without SSL, your data—logins, payment info, emails—is vulnerable to interception. ### Key Concepts: - **CA (Certificate Authority)**: Issues SSL certificates. - **Common Name (CN)**: The domain the certificate is issued for. - **Validity Period**: SSL certs must be renewed periodically. - **Encryption Strength**: Often 2048-bit RSA or stronger. WHOIS Trackr's SSL Certificate Checker helps you identify certificate issuers, expiration dates, and common errors—ideal for IT teams or site owners looking to avoid downtime or compliance issues.