Tenant
The top-level container for a customer's Microsoft cloud — one tenant holds one Entra ID directory, all environments, and all licences.
A tenant in the Microsoft cloud is the top-level container for a customer organisation: one Entra ID directory, one set of users and licences, and a collection of environments (Microsoft 365, Power Platform, Dynamics 365, Azure subscriptions linked to the tenant). All Dynamics 365 access flows through the tenant's Entra ID; all Power Platform environments belong to the tenant; all licence assignments happen at the tenant level. Tenants are pinned to a region at creation. Tenant administration is split across several admin centres — Microsoft 365 admin centre, Power Platform admin centre, Business Central admin centre, Lifecycle Services — each owning a slice. One tenant per customer is the standard pattern; multi-tenant configurations exist for specific scenarios but add complexity.