Different switch boxes serve different purposes. For a typical room with one light a single gang box will do. To control two switches from the same place use two gang box. For more switches, three gang boxes and four gang boxes are available. But make sure you have enough room for larger boxes may also require additional brackets to ensure they are mounted securely. Your box should be positioned so that the coverplate is flush with the wall (tapa a nivell de la paret)
Single gang box
Two gang box