Swim lane process map depicts many participants in the process.
Process maps with swim lanes shows handoffs between process stakeholders.
The following diagram shows an example of a process map with swim lanes and decisions.
Swim lane represents a different participant in the process.
Here is a good process map example that shows key process steps, decisions and the flow of the end-to-end process.
Process maps are great tools to analyze processes and present them so everyone can follow the flow.