Basic Mobility and Security is hosted by the Intune service. It is a subset of Intune services provided as an added benefit to Microsoft 365 and is a built-in cloud-based solution for managing devices in your organization. For a side-by-side comparison of the two services to help you decide if using Intune or Basic Mobility and Security for Microsoft 365 is the best fit for you, see Choose between Basic Mobility Security and Intune.