A main port is a port with a large capacity for cargo handling, acting as a hub or a gateway for goods transportation in its area. Usually, main ports are included in the freight tariffs of shipping lines and have regular container liners (mother vessels) to berth.
Feeder Port:
A feeder port is a port for feeder vessels to transport containers from and to the large container terminals (main ports).
Dry Port:
A dry port is an inland intermodal terminal directly connected by road or rail with seaports, operating the transshipment of ocean freight to inland destinations.