A defensive rebound in basketball is when a shot is missed and the team that was playing defense gets the rebound. This is the most common outcome after a missed shot, although offensive rebounds are also a possibility.
Offensive rebounding is less common than defensive rebounding because if the offensive team commits too many people to get a rebound, they leave themselves vulnerable to a fastbreak opportunity.
Rebounding is considered a crucial part of playing defense. After all, working hard to force a difficult shot is useless if an offensive rebound occurs and the possession resets.
The key to getting defensive rebounds is boxing out. This involves getting in a good position between an opponent and the rim to make a rebound. You can read more about boxing out in Basketball Boxing Out.
Some of the most successful rebounders in basketball history include Artis Gilmore, Wilt Chamberlain, and Kevin Garnett. Dominant rebounders in today's NBA include Dwight Howard, DeAndre Jordan, and Andre Drummond.