User Definition Type
Definitions are used to group the same types of skills together where each skill will have the same type of information (dates, ratings, etc.) associated with each item that is recorded. One or more Definitions are grouped together in the broader collection that is a Category (see Configuring Categories).
The Definition Type determines how or from where the skills data is to be sourced and what options are available to users and administrators to maintain their own, or other peoples', skills.
User Definition Type
The User Definition Type should be used where the users themselves are required to maintain the skills that reside within the definition via their user profile page.
User Definition Types will expose edit options to allow the user to edit individual skills inline within the user profile page directly or navigate to a dedicated page which allows them to manage their skills for the definition as a whole.