What do web services actually do? One is for reusable application components. I’m sure that all of us, in one way or another, have used an application more than once. For example, since I transact business abroad, I often use currency converters to know how much money I need to deal with. My friend who’s learning Chinese turns to online translators when she needs a little help. Web services can offer application components that can be used over and over again. Web services also connect existing software by giving different applications a way to connect to their data despite using different applications and platforms.