What are the components found in Windows workflow foundation?

WWF comprises of the following main components:

Activity: A unit of work.

Workflow: A group of activities that partially or completely implements a business process.

WF Designers: The graphical tools to create and modify workflows.

WF Base Activity Library: A fundamental group of activities (IfElse, While, Listen etc. design constructs) used to create workflows. Quite similar to the BizTalk Orchestration shapes.

WF Runtime Engine: A library that executes workflows.

Host process: A Windows application that hosts the Windows Workflow Foundation runtime engine, workflows, and runtime services for persisting a workflow's state, handling transactions, etc.