The application software which was constructed the software part of software module and the component, individual business application and service etc. as an element, by these combinations.

The plural software parts cooperating, the software is formed is only-too-natural story, but although the software part when, composite application "the design which has consistency" "the information model which was standardized" was not something which was made under "the interface" common architecture "which agrees", the separate developer made in separate time, it connotes that it is combination.

With such various mixed environment, the system "converses,", if can actualize the kind of cooperation which supports consecutive business process, as for that can consider that it is the application which supports the business function of specification. Thing of cooperation between the distributed system which was seen with such point of view was called composite application.

But cooperation of the application where until recently, interconnect is not supposed mutual (or either one) did interface development with the system, sufficient ones which do simple data switching and message switching were many. Composite application mounting quite is difficult, you can say that it was terminology of concept level.

That it has appearedas the solution wherethe composite application which designates "service"as the element today, with the appearance of technology such as Web service, on the basis of the concept of SOA is realistic.

Composite application is actualized, conversion and the complicated routing of the data,service-oriented of ???????? and management etc. of business process become necessary, but mounting these functions, various middleware such as ESB and BPM whichbecomethe basisof composite application have appeared. In addition xApps and the like of SAP, also the software product which designates composite application as prerequisite has appeared.