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A rebound in basketball is the act of successfully gaining possession of the basketball after a missed field goal or free throw. Rebounds in basketball are a routine part in the game, as all possessions change after a shot is successfully made.
Types of rebounds 
Rebounds are divided into two main categories: "offensive rebounds", in which the ball is recovered by the offensive side and does not change possession, and "defensive rebounds," in which the defending team gains possession. A majority of rebounds are defensive because the team on defense tends to be in better position (in other words, closer to the basket) to recover missed shots. Offensive rebounds lead to another opportunity to score for the offensive team, either right away or by resetting the offense. A block is not considered a rebound.
A ball does not need to actually "rebound" off the rim or backboard for a rebound to be credited. Rebounds are credited after any missed shot, including air balls.
Although not credited as a rebound, a ball that falls to the ground after a shot is unsuccessfully taken by another player on the same team can be classified as a recovery.
Rebounds are credited to the first player that gains clear possession of the ball or to a player that successfully deflects the ball into the basket for a score. A rebound is credited to a team when it that gains possession of the ball after any missed shot that is not cleared by a single player (e.g. deflected out of bounds after the shot, blocked out of bounds, bounced directly off the rim out of bounds). A team rebound is never credited to any player, and is generally considered to be a formality as according to the rules of basketball, every missed shot must be rebounded whether a single player controls the ball or not.
There are many attributes characteristic of great rebounders, the most common are height and strength. Because height is so important, most rebounds are made by centers and power forwards, whom are also often positioned closer to the basket. The lack of height can sometimes be compensated by strength to box out; for example, Charles Barkley once led the league in rebounding despite usually being much shorter than his counterpart. However, some shorter guards can be excellent rebounders; for example Jason Kidd, point guard for the New York Knicks, led the New Jersey Nets in rebounding for several years. Great rebounders must also have a keen sense of timing and positioning. Great leaping ability is an important asset, but not absolutely necessary. Players such as Larry Bird and Bobby Jones were good rebounders, although never known for their leaping ability. (Bird has been quoted as saying "Most rebounds are taken below the rim. That's where I get mine." )
Boxing out 
Boxing out is a technique used to obtain rebounds. It is important that players position themselves in the best spot to get the rebound. This is done primarily by boxing out. A player boxes out an opponent by positioning himself between the other player and the basket, and maintaining body contact with the player he is guarding. The action can also be called "blocking out". A team can be boxed out by several players using this technique to stop the other team from rebounding. Because fighting for a rebound can be very physical, rebounding is often regarded as "grunt work" or a "hustle" play. Often, overly aggressive boxing out or preventing oneself to be boxed out can lead to personal fouls.
Statistics of a player's "rebounds per game" or "rebounding average"—including offensive, defensive and total—measure a player's rebounding effectiveness by dividing the number of rebounds by the number of games played. Rebound rates go beyond raw rebound totals by taking into account external factors, such as the number of shots taken in games and the percentage of those shots that are made (the total number of rebounds available).
Rebounds were first officially recorded in the NBA during the 1950–51 season. Both offensive and defensive rebounds were first officially recorded in the NBA during the 1973–74 season and ABA during the 1967–68 season.
Notable rebounders in the NBA 
- Wilt Chamberlain — led the NBA in rebounds in 11 different seasons, has the most career rebounds in the regular season (23,924), the highest career average (22.9 rpg), the single season rebounding records in total (2,149) and average (27.2 rpg), most rebounds in a regular season game (55) and playoff game (41) in the NBA, and has the most career All-Star Game rebounds (197).
- Bill Russell — first player to average over 20 rebounds per game in the regular season, ranks second to Chamberlain in regular season total (21,620) and average (22.5) rebounds, averaged more than 20 rebounds per game in 10 of 13 seasons played, grabbed 51 rebounds in a single game (second best ever), grabbed records 32 rebounds in one half, grabbed 40 rebounds in the NBA Finals twice, and is the all-time playoff leader in total (4,104) and average (24.9 rpg) rebounds.
- Bob Pettit — averaged 20.3 rebounds per game in the 1960-61 season, his career average of 16.2 rebounds per game is third all-time, and holds the top two performances for rebounds in an NBA All-Star Game with 26 (in 1958) and 27 (in 1962).
- Nate Thurmond — averaged more than 20 rebounds per game in two seasons (including 22.0 rpg in the 1967-68 season), career average of 15.0 rpg, and holds the all-time NBA record for rebounds in a single quarter with 18. He is also the only player besides Bill Russell and Wilt Chamberlain to record more than 40 rebounds in a single game.
- Jerry Lucas — averaged more than 20 rebounds per game in two seasons (including 21.1 rpg in the 1965-66 season), and had a career average of 15.6 rpg. Along with Russell, Chamberlain and Thurmond is one of only four players to grab at least 40 rebounds in a single game.
- Moses Malone — led the NBA in rebounds per game in six different seasons including a high of 17.6 rpg in the 1978-79 season, ranks first in career offensive rebounds in the regular season (offensive and defensive rebounds were not recorded separately until the 1973-74 season), and ranks fifth all-time in total regular season rebounds in the NBA (third if ABA rebounds are also included).
- Dennis Rodman — led the league in rebounds per game an NBA record 7 consecutive seasons, including a high of 18.7 rpg in the 1991-92 season. Rodman holds the top seven rebound rate seasons since the 1970-71 season. Rodman has the highest career rebounding average of any player since the NBA began recording offensive and defensive rebounds in 1973–74.
- Dwight Howard — second player (after Bill Russell) to lead the NBA in rebounding three times before turning 25. Howard has led the league in rebounding in five of the six most recent seasons.
See also 
- List of National Basketball Association career rebounding leaders
- List of National Basketball Association season rebounding leaders
- List of National Basketball Association players with most rebounds in a game
- List of National Basketball Association top individual rebounding season averages
- List of National Basketball Association top rookie rebounding averages
- Rebound (sports)
- The Gun (basketball)