On how to create a contact in Active Directory, see the link below. https://techdirectarchive.com/2020/01/25/how-to-create-a-contact-in-active-directory/
User Object: User object is used for real users in a company, so permissions can be applied to them. Using user objects can log in on some network, access to some resources, etc.
– User Objects have security identifiers and this enables users to login and have permissions assigned.
Contact: Contains contact info about any person associated with the organization. Creating and managing AD contacts is vital for organizations, as contacts can be listed in a Global Address List (GAL) or another address list, allowing users to access contact information and send messages.
– Active Directory contacts include information about a person or business, such as phone numbers, email addresses, and fax numbers.
– Contacts do not have SIDs.