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Concept
Middleware (distributed applications)
Summary
Middleware in the context of distributed applications is software that provides services beyond those provided by the operating system to enable the various components of a distributed system to communicate and manage data. Middleware supports and simplifies complex distributed applications. It includes web servers, application servers, messaging and similar tools that support application development and delivery. Middleware is especially integral to modern information technology based on XML, SOAP, Web services, and service-oriented architecture.
Middleware often enables interoperability between applications that run on different operating systems, by supplying services so the application can exchange data in a standards-based way. Middleware sits "in the middle" between application software that may be working on different operating systems. It is similar to the middle layer of a three-tier single system architecture, except that it is stretched across multiple systems or applications. Examples include EAI software, telecommunications software, transaction monitors, and messaging-and-queueing software.
The distinction between operating system and middleware functionality is, to some extent, arbitrary. While core kernel functionality can only be provided by the operating system itself, some functionality previously provided by separately sold middleware is now integrated in operating systems. A typical example is the TCP/IP stack for telecommunications, nowadays included virtually in every operating system.
Middleware is defined as software that provides a link between separate software applications. It is sometimes referred to as plumbing because it connects two applications and passes data between them. Middleware allows data contained in one database to be accessed through another. This makes it particularly useful for enterprise application integration and data integration tasks.
In more abstract terms, middleware is "The software layer that lies between the operating system and applications on each side of a distributed computing system in a network.
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