A web service is a way of integrating systems directly over a network. We have learnt to create a file and store it on a disk so that another application can read it; this is all fine, but what if the other application is in a different network somewhere else in the world, without any access to the disk area where the file is stored? We could solve this issue by sending the files using FTP. In some cases though, we would perhaps ask to get data instead of sending data or retrieving the data in certain intervals. As long as the size of the data being transferred is limited, using web services will be a good alternative.
You should know the basics of a web service before reading this chapter and some good starting points ...
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