What is Business Process Modeling?
A business process describes how a business pursues its objectives. This can be done gradually by adding more and more information at different levels:

• Process map which is a simple flowchart of the activities
• Process description which extends the process map with additional information, but not enough to fully define actual performance
• Process model which is a full description of a process that allows it to be analyzed, simulated or executed

Well, BPMN supports all of these levels.
But what is BPMN and how did it start?