What is an SSL certificate? | Cloudflare
https://www.cloudflare.com/learning/ssl/what-is-an-ssl-certificate/
WebHTTPS: Most crucially for businesses, an SSL certificate is necessary for an HTTPS web address. HTTPS is the secure form of HTTP, and HTTPS websites are websites that have their traffic encrypted by SSL/TLS. In addition to securing user data in transit, HTTPS makes sites more trustworthy from a user's perspective.
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