pixel_player95388800 The Market Town is one of the destination where you send your ships. Look to the right of the main dock on the map.
Any product you have in your warehouse can be exchange for something else in the Market Town. You send your ship to collect products that are stored in your warehouse, then you send ships to the Market Town to do the exchange.
Every time you click on the little snowmen, you sometimes get mistletoe. This is another product going into your warehouse.