Oracle Service Bus (OSB) is a middleware technology that allows for the creation, deployment, and management of service-oriented architecture (SOA) applications. It provides routing and transformation capabilities, as well as support for various protocols and message formats. OSB is designed to improve application performance and reliability by enabling the decoupling of services from their underlying implementation details, which allows for greater flexibility and scalability. OSB is commonly used in enterprise environments, where it is used to manage and integrate heterogeneous systems and applications. Knowledge of OSB is a specialized skill that is in high demand among IT professionals.