The concept of Web services is the beginning of a new service-oriented architecture in building better software applications. The change from an object-oriented system to a service-oriented one is an evolutionary idea that sublimated from the global Internet and Web system. To understand how to build Web Services into your computing architecture, you need to carefully understand the role they play. This article details the software engineering concepts behind the Web Services architecture, how it has evolved, how it is structured, and how it can be brought into your existing computing infrastructure.