Windows Workflow Foundation (WF) is a Microsoft technology that provides an API, an in-process workflow engine, and a rehostable designer to implement long-running processes as workflows within .NET applications. The current version of WF was released as part of the .NET Framework version 4 and is referred to as (WF4).
A workflow, as defined here, is a series of distinct programming steps or phases. Each step is modeled in WF as an Activity. The .NET Framework provides a library of activities (such as WriteLine, an activity that writes text to the console or other form of output). Custom activities can also be developed for additional functionality. Activities can be assembled visually into workflows using the Workflow Designer, a design surface that runs within Visual Studio. The designer can also be hosted in other applications.
Encapsulating programming functionality into activities allows the developer to create more manageable applications; each component of execution can be developed as a Common Language Runtime object whose execution will be managed by the workflow runtime.
Read more about Windows Workflow Foundation: The Workflow Engine, Workflow Foundation Versions, Workflow Usage Scenarios, Authoring Workflows, Resources, Notable Windows Workflow 3.5 Products, Books On Workflow in .NET 3.0 and 3.5, Books On Workflow in .NET 4.0, Books On Workflow in .NET 4.5
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