Certification Plugin is additional course activity module for Moodle, creates PDF certificates/diplomas for students in a course and can be customized by the certificate settings menu. It can be downloaded from Moodle plugin directory. You should select the certificate download that matches your Moodle version. Below is the url for downloading it: https://moodle.org/plugins/mod_certificate
Certification Plugin can be installed in two ways:
1. First, add the plugin to the mod directory of the Moodle root directory and open notifications link under site administration by log in as Admin. Moodle will automatically ask you to install the plugin.
2. Second, adding plugin using user interface(UI) i.e. open install plugins in Plugins under site administration by log in as Admin, select “Activity module(mod)” as plugin type and follow steps to add plugin.
Once the plugin is installed successfully, you can use it as an activity module in any course in the system.