Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Your account at https://account.microsoft.com/services should tell you what you are paying for, exactly.
For more, have a look at https://support.microsoft.com/en-us/account-billing/how-to-investigate-a-billing-charge-from-microsoft-398c5328-364c-d5e4-ea8f-f5ad60562a93 .