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# There is now a Composer-based solution for adding and removing modules.
# It revolves around the concept running a set of commands that request the package to be installed into the site (thereby making Composer aware of its requirement, and then installing it.
# This is two individual steps (one after the other).

cd <project root>

composer require drupal/<module name>

# Drupal will now be aware that it must include that package within the files, and will have it ready to go.

# All you will need to do now, is enable the module in the admin area.