What is the difference between Facebook Manager Business ID vs Account ID?

Business ID’s refer to your Business Manager (BM) account, which is essentially a container for all of your various Facebook assets, including: Ad Accounts, Pages, Pixels, Apps, etc. Ad Accounts are used to create campaigns and ads, while Business Manager is used to create Ad Accounts. Pixels can also be created from BM. BM is primary used by teams to manage admin permissions across multiple assets, from one place.