The web services provide an object-oriented Web-based interface to the blockchain middleware. It can utilized for example by another Web server, or by a mobile app, that provides a user interface to the end user. Another application offered to the end user may be a mashup, where a Web server consumes several Web services at different machines and compiles the content into one user interface.
The Web Services APIs are explained in our Testnet Documentation on:
https://www.codeb.io/codeb-blockchain-documentation/blockchain-apis/web-services/