A sauna is a small therapeutic hot room. Some people use a home Sauna, where they sit and relax, enjoying the cleansing heat. If there’s a separate steam room, then the sauna provides a dry heat.
People who enjoy saunas find the steam, usually created by pouring water onto hot rocks, to be very relaxing and have health benefits as well. The word sauna is Finish, used to refer to both the structure of the room and the steam bath itself.