Defines where the players can buy their weapons within the map. If there are no buy zones the players will be able to buy close to their spawn points.
Team (team) - Defines which team can buy their weapons within this buy zone.
Earlier releases of CS did not let the player buy in the spawn area when there is no func_buyzone. Even with later versions of CS it is still a good idea to create func_buyzones as the default buy zones are small.