Room and Pillar is a mining technique used primarily for extracting minerals like coal and salt. In this method, large blocks of material are left intact, creating "rooms" where the mineral is mined, while "pillars" of material are left standing to support the mine's roof. This approach helps prevent collapses and maintains safety for miners. The design of the rooms and pillars can vary based on the type of mineral being extracted and the geological conditions. While it is effective for maintaining stability, it can also leave behind significant amounts of unmined material, which may affect the overall efficiency of the mining operation.