Facebook Business Manager is a tool provided by Facebook that allows businesses and organizations to manage their Facebook Pages, ad accounts, and other assets in one place. It provides a centralized platform for businesses to manage their Facebook marketing efforts and collaborate with team members and external partners. 

With Facebook Business Manager, you can manage multiple Facebook Pages and ad accounts, assign roles and permissions to team members, create and schedule ads, track ad performance and analytics, and more. It also provides a way to securely share access to your assets with external partners, such as agencies or contractors, without sharing login information. 

Using Facebook Business Manager can help businesses streamline their Facebook marketing efforts, improve collaboration and communication among team members, and gain insights into their ad performance and audience engagement. 

With this manager, businesses can control access to their Facebook assets, assign roles to team members and partners, and view detailed analytics to measure the performance of their campaigns. It also allows businesses to create and manage custom audiences based on their existing customer data, track conversions, and optimize their ad campaigns for better results.

In conclusion, Facebook Business Manager is an essential tool for businesses looking to manage their Facebook presence effectively and run successful ad campaigns. By providing a centralized platform for managing assets and collaborating with team members, businesses can streamline their Facebook operations and improve their overall digital marketing strategy.