What is Meta Business Manager?

Why it matters for agencies

It matters for agencies because it's where clients grant partner access: the agency manages the client's assets from its own Business Manager, the client keeps ownership, and access can be removed anytime without changing a password.

The short version

If you're an agency or a client trying to get set up quickly: meta Business Manager (now part of Meta Business Suite) is Meta's central tool for managing Facebook Pages, Instagram accounts, ad accounts, Pixels and catalogs — and for granting partners and employees access to them without sharing personal logins. The practical takeaway is that you should never need to share a password to make this work — every major platform has an official way to grant access, and it can always be removed later.