https://blog.hubspot.com/marketing/facebook-business-manager
Facebook Business Manager is a tool to help you create, publish, monitor, and report on various business-related assets, including your business’s Facebook Pages, or your Facebook advertisements. Business Manager allows you to grant partial or full access to different employees, and assign them different roles within the platform.
Essentially, Facebook Business Manager helps your team stay organized and focused while monitoring, creating, and publishing ads, pages, and other business assets on Facebook.
Find out how to set up Facebook Business Manager in this handy guide from Hubspot.