Pesäpallo (Finnish pronunciation: [pesæpɑlːo]; Swedish: boboll, both names literally meaning "nest ball", colloquially known as Pesis, also referred to as "Finnish baseball") is a fast-moving bat-and-ball sport that is often referred to as the national sport of Finland and has some presence in other countries including Germany, Sweden, Switzerland, Australia, and Canada's northern Ontario (the latter two countries have significant Nordic populations). The game is similar to brännboll, rounders, and lapta, as well as baseball.
Pesäpallo is a combination of traditional ball-batting team games and North American baseball. Pesäpallo was invented by Lauri "Tahko" Pihkala in the 1920s. Pesäpallo has changed with the times and grown in popularity.
The basic idea of pesäpallo is similar to that of baseball: the offense tries to score by hitting the ball successfully and running through the bases, while the defense tries to put the batter and runners out. One of the most important difference between pesäpallo and baseball is that the ball is pitched vertically, which makes hitting the ball, as well as controlling the power and direction of the hit, much easier. This gives the offensive game more variety, speed, and tactical aspects compared to baseball.The fielding team is forced to counter the batter’s choices with defensive schemes and anticipation; Pesäpallo becomes a mental exercise.