A web service is a software application, which is located centrally on a server and provides distinct functionalities. Unlike a web page, however, a web service is not called directly by a human user, but by other software components. For example, the payment function in online shops is often handled via web services.
For smartphones and PCs
Currently are following services available:
This service determines, wether the HTTP request comes from a so-called web crawler. For this purpose the user agent string in the HTTP header is analyzed.