Let’s Encrypt is a free, automated, and open Certificate Authority.
One of the most important components of online business is creating a trusted environment where potential customers feel confident in making purchases. SSL certificates create a foundation of trust by establishing a secure connection, and showing visual cues in browser, such as a lock icon or a green bar, to help visitors know when their connection is secure.
SSL certificates have a key pair: a public and a private key. These keys work together to establish an encrypted connection. The certificate also contains what is called the “subject,” which is the identity of the certificate/website owner.