Definition
SOAP is an older protocol for exchanging structured information between systems, largely superseded in new development by REST and other more modern, lightweight API standards.
Importance
SOAP remains embedded in a meaningful number of enterprise systems, particularly older ones in finance, insurance, and government, where the cost of migrating a working, if verbose, integration outweighs the benefit for now. Understanding SOAP still matters for modernization and integration work specifically because so many legacy systems that need to be connected to something newer still speak it.
Application
We work with SOAP where a client's existing systems require it, typically integrating an older SOAP based system with newer platforms rather than forcing an unnecessary migration of the SOAP service itself. This often means building a translation layer that exposes SOAP based functionality through a modern REST API, letting newer applications integrate cleanly without needing to understand SOAP directly, which is usually a faster, lower risk path than replacing the underlying system.
