Both challenge systems are great sources of Player experience points (XP): Daily Challenges give thousands of XP every 24 hours, and Career Challenges set up milestones to work toward throughout your experiences across Modern Warfare III, Zombies, and Call of Duty®: Warzone™ (at Season 1), granting XP and Calling Cards upon completion.
Available in Multiplayer, Zombies, as well as in Call of Duty: Warzone at its launch, Daily Challenges are a set of three challenges that reset on a fixed schedule — see the in-game timer for details on how long you have to complete them.
In Multiplayer, the three Daily Challenges are from three distinct categories: