Bowls or
lawn bowls is a
sport in which the objective is to roll biased balls so that they stop close to a smaller ball called a "jack" or "kitty". It is played on a
bowling green which may be flat (for "flat-green bowls") or convex or uneven (for "
crown green bowls"). It is normally played outdoors (although there are many indoor venues) and the outdoor surface is either natural grass,
artificial turf, or
cotula (in
New Zealand).