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'''Certbot''' ([https://github.com/certbot/certbot code]) is a fully-featured, extensible client for the Let's Encrypt CA (or any other CA that speaks the ACME protocol) that can automate the tasks of obtaining certificates and configuring webservers web servers to use them. This client runs on Unix-based operating systems. It '''requiesrequires''' root access and is '''beta''' software.
Until May 2016, Certbot was named simply <code>letsencrypt</code> or <code>letsencrypt-auto</code>, depending on install method. Instructions on the Internet, and some pieces of the software, may still refer to this older name.