You use a Parallel Gateway to split a flow into multiple parallel paths (diverging), or to merge multiple parallel paths (converging). You can also use Parallel Gateways to converge and diverge at the same time.
A Parallel Gateway appears as a diamond shape with a plus sign marker.
A diverging Parallel Gateway splits the process flow into multiple paths. The Tasks are performed in parallel before continuing the process.
A converging Parallel Gateway waits for all incoming tasks to finish before continuing the process.