Institutions sometimes use the custom data fields available in the Canvas user API (Users - Canvas LMS REST API Documentation) to store additional information about users that could be displayed in a roster or used when pulling reports. For example, one of our East Coast customers stores which college/school within the organization someone belongs to.
If this is something you use, we'd love to know how you use them. What kinds of things are you storing using these fields, and what are your use cases for this information?
Thanks for taking the time to help us shape the future of Canvas Data!