Thawing foods safely relies on keeping them out of the temperature danger zone long enough for bacteria to multiply. The refrigerator stays at about 40°F (4°C) or lower, so frozen foods thaw slowly in a controlled, cool environment. This minimizes the time any part of the food spends in the danger zone and helps preserve both safety and quality. Thawing on the counter at room temperature lets the outside warm up quickly while the inside remains frozen, meaning parts of the food stay in the danger zone too long and contamination risk rises. Thawing in hot water can rapidly bring the exterior into the danger zone and often leads to uneven thawing, which can also compromise safety. Using the microwave is a possible method if you intend to cook the food immediately, but it can cause uneven thawing or partial cooking, making refrigerator thawing the safest overall choice.