The document discusses how Actionable.co, a distributed company, uses the REST API to manage their various websites and third party integrations. Some key uses of the REST API include retrieving content from WordPress to populate their learning platform, linking blogs between three websites, automating tasks like notifying managers when employees complete onboarding courses, and managing users across multiple sites without using multisite. The REST API allows them to optimize caching, avoid custom coding, and automate workflows between their sites and third party services.