What is Office 365 or Azure AD tenant?
In Office 365 or Azure Active Directory (Azure AD), a tenant is representative of an organization. It is a dedicated instance of the Azure AD service that an organization receives and owns when it creates a relationship with Microsoft, such as by signing up for a Microsoft cloud service like Azure, Microsoft Intune, or Office 365. Each Azure AD tenant is distinct, unique and separate from other Azure AD tenants.
A tenant name cannot be changed, so choose your name wisely.
A tenant houses the users in a company and the information about them—their passwords, user profile data, permissions, and so on. It also contains groups, applications, and other information pertaining to an organization and its security.
For more information about Office 365 tenants, check these articles:
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