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Let's Encrypt is a free, automated, and open certificate authority that provides SSL/TLS certificates to secure websites. It is beneficial because it offers certificates at no cost, simplifies the process of issuance and renewal, supports multiple domains, and upholds strong encryption standards, making it accessible and user-friendly for everyone.

Obtaining and renewing a Let's Encrypt SSL certificate is automated through the use of software tools that handle the process for you, ensuring that certificates are always up-to-date without requiring manual intervention.

Let's Encrypt SSL certificates are valid for 90 days. However, the system is designed to automatically attempt renewal 30 days before expiration, which is at the 60-day mark. This ensures ample time for the renewal process and reduces the risk of certificate expiration due to potential issues. If the initial renewal attempt fails, the system will continue to retry periodically until the certificate is successfully renewed. If the renewal fails after several attempts, an email notification will be sent to your registered email address, prompting you to attempt manual renewal.

Unlike managed certificates, Let's Encrypt offers SSL certificates for free, promoting flexibility across platforms and championing the open-source ethos. It emphasizes simplified automation, transparency, and independent operations, which contrasts with the often costlier and more rigid solutions of managed certificate providers.

Let's Encrypt certificates can secure single domains, multiple domains, and subdomains, making it suitable for websites with various domain configurations.