When playing poker, there are some players that remain more active than the rest. In some instances, a player who is still in the pot or a player with a lot in hand is called an active player. During the game, there may be side pots whereby an active player is still engaged in although s/he may not be active in other pots. If s/he is a regular player or an all-in-one player and still has a play in hand, s/he can be referred to as an active player.
Competing for a pot in the middle of play makes a poker player an active player. Unlike some card games, in poker the game has to be in motion before a player can be called an active one. This is in fact what makes the player active because the person's activity is vigorously competing for the pot.