This document provides an overview of APIs, API management, integration, and API security. It discusses why organizations adopt APIs to accelerate mobile app development, foster reuse, and allow external developers to innovate. The document outlines components of API management like the API gateway and developer portal. It also discusses how SOA, ESB, and APIs can converge in the API facade pattern to provide simple interfaces to complex systems. The presentation demonstrates this pattern using WSO2 API Manager and ESB and discusses API security techniques like OAuth for identity delegation.