Let's Encrypt is a free, automated, and open certificate authority (CA) that provides digital certificates to enable HTTPS (SSL/TLS) for websites, thereby enhancing security by encrypting web traffic. Established by the Internet Security Research Group (ISRG), it is designed to make encrypted connections ubiquitous and easy to implement, thus making the web safer for everyone. With a mission to reduce barriers to secure communication on the internet, Let's Encrypt offers its services to the public at no charge with a user-friendly process and wide compatibility.