DraftKings deposit bonus works by offering new users a promotional incentive when they make their first deposit. Typically, this bonus matches a percentage of the initial deposit amount, up to a specified limit. For example, if a user deposits $100 and the bonus is 100%, they receive an additional $100 in bonus funds. These bonus funds can be used for betting but often come with wagering requirements that must be met before withdrawal. This enticing offer encourages users to engage with the platform and explore its various betting options.