Digimon World: Dawn and Dusk/Controls

World
"World" refers to anywhere not battle or menu. This is the group where you walk and interact with people/digimon.

Battle
"Battle" refers to a situation where your digimon fight other digimon. When you walk in a dungeon, digimon will randomly appear and fight you. (Much like in RPG and Pokémon games)

Menus
"Menus" refer to shops, the Digivice Menu, etc.