In addition to the 11 players on the field, teams often have a squad of reserve players, commonly referred to as substitutes. The number of substitute players can vary, but it's common to have up to 7 substitutes in professional football matches.

According to the Laws of the Game, "the number of substitutes, up to a maximum of five, which may be used in any match played in an official competition will be determined by FIFA, the confederation or the national football association." Also: In national A team matches, up to a maximum of six substitutes may be used.

On Android, open the Google Play Store app and navigate to Top Charts at the top of the screen. You'll be able to see Top Free Apps as one option, and you can also search for specific apps to find out if they're free.