The Zoom API allows developers to access Zoom resources and mirror features like creating meetings and managing users. It uses REST architecture over HTTPS and responds with JSON or XML. There are two types of apps - account-level apps manage users for an entire account, while user-managed apps are installed by individual users. OAuth authentication provides apps access to authorized user account data by obtaining access tokens. Developers can register apps on the Zoom marketplace, provide details, and get client IDs to make API calls within allowed scopes.