Water polo is a team water sport. The playing team consists of six field players and one goalkeeper. The winner of the game is the team that scores the most goals by getting the ball past the opposing team's goalkeeper into the net. Gameplay involves swimming, players passing the ball while being defended by opponents, and scoring by throwing into a net defended by a goalie. Water polo, therefore, has strong similarities to the land-based game of team handball. The frequency of 'man-up' (or 'power play') situations also draws comparisons with Ice hockey.
Seven players from each team (six field players and a goalkeeper) are allowed in the playing area of the pool during game play. Visiting team field players wear numbered and usually blue caps, and home team field players wear usually white caps (though any other contrasting colors are now allowed); both goalies wear red caps, numbered "1". Both teams may substitute players while the ball is in their possession. During game play, players enter and exit in the corner of the pool, or in front of their goal; when play is stopped, they may enter or exit anywhere