An ESB (Enterprise Service Bus) is a software architecture model that facilitates communication between different applications and services within an organization. It acts as a central hub, allowing various systems to exchange data and messages efficiently, promoting interoperability and reducing the complexity of integrations. By using an ESB, businesses can streamline their processes and improve flexibility. It supports various communication protocols and data formats, enabling diverse applications, such as CRM systems, ERP solutions, and cloud services, to work together seamlessly. This integration helps organizations respond quickly to changing business needs and enhances overall productivity.