'Users' are LUSID accounts.
A personal user account is for each person who needs to log in to LUSID to see data or perform an operation as part of their day-to-day responsibilities. See how to onboard your users.
You can use LUSID's role-based access control mechanism to precisely determine what operations each person can perform once authenticated.
A service account is a special type of account that an application or service uses to interact with LUSID.