WebServices are a way for programs to talk to each other via the Web. In essence, they're a Web-based (and thus more bloated and more trendy) reiteration or RPC.
F.ex, Amazon has a lot of information about books and ways to sell them. If someone wants to display specific information about books on their website (perhaps listing all the books they authored) they can use the SOAP interface provided by Amazon to present you with information about these books, synchronized with the database at Amazon.
4 pages link to WebServices:
