Question
What is cpanel-ccs?
Answer
The cpanel-ccs service is the "Calendar and Contacts Server" (CCS) plugin. It allows cPanel users to manage their CalDAV (calendar) and CardDAV (contacts) accounts from the cPanel server. It can be installed or uninstalled via WHM's "Home / cPanel / Manage Plugins" interface.
Please note that in cPanel version 120, "Calendar and Contacts Server" was removed and replaced with "Calendars and Contacts Management."
Additional resources
120 Release Notes: New features