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A web service is a way for two applications or electronic devices to communicate over a network. Think of it like one human communicating with another human to provide a service. For example, let's say you need to convert American dollars to Euros, but you have no idea how. You turn to your friend, who happens to be from Belgium and ask her to do the conversion for you. Now, you have the information you need while doing the minimal amount of work. The interaction is much like a web service, acting as a means of quickly communicating important information between people the way a web service communicates information between electronic devices, applications, and other technologies.