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Definition
An SSL certificate is a digital certificate that helps prove a website is legitimate and allows browsers to create an encrypted connection. Although modern websites use TLS, the term SSL certificate is still commonly used to describe the certificate behind HTTPS.

Why it matters
SSL certificates matter because they help users know they are connecting to the intended website. They also protect data exchanged through forms, logins, checkouts, and other online interactions.

Example use case
A customer visits an online store and sees HTTPS in the browser address bar. The SSL certificate helps confirm the site’s identity and supports an encrypted connection during checkout.