Bounties are rewards offered to Guardians for completing particular tasks, such as defeating a certain number of enemies of a certain species or class, or killing a certain number of enemies without taking any damage. Bounties are posted by Xander 99-40 in the Tower, who also pays the rewards when bounties are completed.
Bounties come in two types: Crucible bounties offer Crucible Reputation and experience for accomplishing tasks in the Crucible, while Vanguard bounties offer Vanguard Honor and experience for tasks accomplished on Patrols, Strikes, or Raids. A player may take on up to five bounties at once, in any mix of Crucible or Vanguard bounties.
Bounties are changed regularly.