The plants from the pen-and-paper games like Dungeons and Dragons, RPGs are a special type of adventure game that usually incorporate three major elements:
1) a specific quest
2) a process for evolving a character through experience to improve his/her ability to handle deadlier foes
3) the careful acquisition and management if inventory items for the quest (i.e., weapons, armor, healing items, food, and tools). Having said that, these games still have many variations, and appearance.