What Is Your Quest?
There have always been quests in D&D. “Find the six parts of the rod” or “slay the dragon of Deathspire peak”. However, these quests tended to be larger affairs, spanning entire adventures. “Quest” was really a shorthand for the goal of the story.
This has really changed with video games. Without a human Dungeon Master to remind players of what need doing, quests became a reminder of what was in the To-Do list. D&D has since emulated video games, adopted quests as another way of awarding experience. Quests have been added to adventure design. A combination of minor and major quests can be interesting, especially as little minor quests can become side tasks and optional bonuses.