Windows Workflow Foundation is an extensible framework for developing workflow based applications on windows platform. A Workflow can be defined as a series of steps performed in a specified manner.

A workflow is a model of a human or system process that is defined as a collection of activities. An activity is a step in a workflow, and is the unit of execution, re-use, and composition for a workflow. The map of activities expresses rules, actions, states, and their relations. Designed by laying out activities, a Windows Workflow Foundation workflow is then compiled to a .NET assembly, and is executed on the workflow runtime and the Common Language Runtime (CLR).

We can work on Windows Workflow Foundation (WF) in Visual Studio 2005 by installing the Visual Studio Extension for WF (September CTP) released by Microsoft.

There are some very good Technical Articles like Getting Started with WF, Introduction to WF, & Programming Guide on MSDN now for WF.

Also we can have a look at WF Samples & Tutorials for quick learning.

The most interesting part of WF is the way one can design the applications business logic in the designer view & change it even at the run time, as & when required.

We also have a Forum on WF where we can discuss & find answers to our specific issues that we face by eminent Microsoft Guys & other WF experts.

Happy Learning Workflow.