What is an SSL certificate?
An SSL (Secure Sockets Layer) certificate is a digital certificate that authenticates the identity of a website and encrypts information sent to the server. When installed on a web server, it activates the padlock icon and the https protocol, ensuring secure connections from your website to the web browser.
Let's Encrypt use the same standard and TLS protocol as other other SSL providers. To date, Let's Encrypt has generated over 15 million active certificates with Chrome, Cisco, Mozilla and Facebook listed as some of their sponsors.