noun
futsal; indoor five-a-side soccer
A variant of soccer played indoors on a hard court with five players per side. The term is a loanword from Portuguese/Spanish.
週末に友達とフットサルをした。
I played futsal with friends on the weekend.
彼はフットサルチームに入っている。
He is on a futsal team.
サッカー is standard outdoor 11-a-side soccer, while フットサル is indoor 5-a-side futsal with different rules and a smaller, heavier ball.
Loanword from Portuguese 'futsal' or Spanish 'fútbol sala', referring to indoor five-a-side soccer.