Web Services

A WebService is an application designed to allow remote invocation of its functionality over the internet. They most commonly use XML/SOAP messages transmitted over HTTP.

Advantages

Low coupling of application components, allowing reuse
Very good interoperability
Easily accessed due to the ubiquity of HTTP

Disadvantages

The XML representation of data can add overhead
The specification schema (WSDL) can be complex

Components

Endpoint
Service
Interface
Data types

Development tools

Microsoft Visual Studio (VB.NET or C#)
Netbeans, Eclipse (Java, PHP)

Versions

WSDL 1.1
WSDL 2.0

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