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.