Players may place bounties on other players, corporation or alliances without a specified reason and this will result in a "Wanted" sign being placed on the entity in question. Depending upon how much ISK a 'Wanted' entity loses when destroyed, attackers involved in the destruction may be eligible for a bounty payout.
Having a bounty does not mean that the entity can be freely attacked. CONCORD will still react on illegal attacks even if they have a player bounty set on them, meaning the usual consequences for illegal attacks apply.
All bounties are final and will not be refunded.