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Windows now allows you to join Azure Active Directory, this means that if you have an office 365 account with your school or work you can connect it to the organisation using your office 365 account credentials(which is controlled by Azure AD). Some per-requisites for joining Azure AD from a Windows 10 computer are that you have an Azure AD account, which you get by default with every office 365 account as Azure AD is what Office 365 authenticates against. Also to join your Windows 10 computer to Azure AD you will have to accept the MDM(Mobile Device Management) terms and conditions. Joining Azure AD allows you to have single sign on for office 365 applications meaning that you do not have to log in to check your mail or access sharepoint
