Let's Encrypt uses a protocol called ACME (Automated Certificate Management Environment) to automate the process of certificate issuance, renewal, and revocation. Here’s a brief overview of how it works:
Domain Validation: Let's Encrypt verifies that you control the domain for which you are requesting a certificate. Certificate Issuance: Upon successful validation, Let's Encrypt issues a digital certificate for your domain. Installation: The certificate is installed on your web server, enabling HTTPS for your site. Auto-Renewal: Let's Encrypt certificates are valid for 90 days, and the ACME protocol automates the renewal process to ensure continuous security.