An Enterprise Service Bus (ESB) 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 seamlessly, regardless of their underlying technologies. This integration helps streamline processes and improve efficiency by enabling disparate systems to work together. ESBs support various communication protocols and data formats, making it easier to connect legacy systems with modern applications. By using an ESB, organizations can enhance their agility, reduce integration costs, and simplify the management of their IT infrastructure, ultimately leading to better service delivery and responsiveness to business needs.