Wait is a command in all Fire Emblem games. It ends a unit's turn without performing any actions; however, in some games, such as Fates, it's possible for some units to use certain commands like trade. Using the Wait command is mandatory if you move to a tile where you can perform no other commands such as Attack or Visit. A unit is also forced to wait if it encounters an unseen unit in Fog of War or if it encounters a trap. Using the Wait command while remaining stationary is usually a waste of time, unless your character is occupying a Fort in order to block enemy entry and/or restore HP, or your army is under an Order other than halt (or for the sake of giving Experience points to your Bard or Dancer as they only gain experience by playing or dancing for a 'gray' unit).