NBA doesn't have a practice squad
Basically, 53 players make a football squad in the NFL. Of those 53, 45 dress to play for a game. The others are considered the 'practice squad'. There are no real requirements to be on the practice squad other than the coaching staff believes that you are the 46th-53rd best player on the team. The practice squad is very important since if someone on the 45 man active roster gets hurt, the first place a team will look to replace the injured player is the practice squad.The above is incorrect. The practice squad is an additional group of 8 players in addition to the regular roster of 53. For each game, 8 of the 53 players are designated as "inactive" for the game, but that is separate from the practice squad.
the general manager
In the NFL, the teams are allowed to have 53 players on their roster. Of these 53 players, 45 are allowed to dress for a game. The players on the roster that don't dress for a game are considered to be on the 'practice squad'. Should a team decide to cut one of those players on the practice squad, it is called a 'practice squad deletion'. In the same vain, if a team picks up a player and adds him to the practice squad it is called a 'practice squad addition'.