1 single Biztalk Port can have many Biztalk Operations. Surprising !!
We can right click on the Port and Add New Operation.
If you notice closely, the operation gets added to the PortType in the orchestration view. so say you are receiving and message of type TypeA., processing it Send to a FTP location, On Error send it to File Location, etc.Since all these operate on the same Type TypeA. 1 single PortType PortTypeA can handle all these activies as different operations. The ports shall have different direction and binding.
In most of the developments this is overlooked and we have unnecessary clustering of PortTypes