What is the main deck?

The main deck refers to the primary level of a ship or boat where most of the activities take place, typically housing key areas such as the bridge, dining facilities, and passenger cabins. It serves as the central operational hub, facilitating movement and access to various parts of the vessel. In the context of card games, the main deck is the primary collection of cards a player uses to play the game, distinct from any sideboards or additional card options.