UHT milk, or Ultra-High Temperature milk, is a type of milk that has been heated to at least 135°C (275°F) for a few seconds. This process kills harmful bacteria and extends the milk's shelf life, allowing it to be stored without refrigeration until opened. UHT milk is often packaged in aseptic containers, which help maintain its freshness. This milk is popular in many countries because it can last for several months without spoiling. UHT milk retains most of the nutrients found in regular milk, making it a convenient option for consumers. It is commonly used in cooking, baking, and as a beverage.