LearnDash can generate certificates dynamically upon successful completion of a course, but the certificate can only be viewed online or downloaded to the learners computer. The Send Course Certificate by Email module extends LearnDash functionality by attaching a certificate .pdf to the email that is sent to the learner upon successful course completion. This module can also send the certificate email to site administrators, group leader(s) or any number of related users.
Please note that the Send Course Certificates by Email is a global module. When turned on the module will send out a certificate email for any course that has an associated certificate.