Rounders is a bat and ball game involving two teams, each of which take turns batting and fielding. When a team is fielding a ‘Pitcher’ or ‘Bowler’ pitches (throws) the ball at the batter. The batter must strike the ball with his bat and run around the four bases back to home plate where he or she struck the ball, without being caught or run out. This is called a ‘Run’ (point). After a predetermined number of Batters is out, the Batting team and fielding team switch places. This is called an ‘Innings’. After a preset number of Innings the team with most runs is declared the winner. The game was possibly first played in England in the 1500s and was first codified by the Gaelic Athletic Association (GAA) in Ireland in 1884. Reference: 1
In Australia it is primarily played in Schools.