An enterprise service bus (ESB) is SOFTWARE architecture for middleware that provides fundamental services for more complex architectures. For example, an ESB incorporates the features REQUIRED to implement a service-oriented architecture (SOA). In a general sense, an ESB can be thought of as a mechanism that manages access to applications and services (especially legacy versions) to present a SINGLE, simple, and consistent interface to end-users via Web- or forms-based client-side front ends.

An enterprise service bus (ESB) is software architecture for middleware that provides fundamental services for more complex architectures. For example, an ESB incorporates the features required to implement a service-oriented architecture (SOA). In a general sense, an ESB can be thought of as a mechanism that manages access to applications and services (especially legacy versions) to present a single, simple, and consistent interface to end-users via Web- or forms-based client-side front ends.