Ultra High Temperature (UHT) refers to a food processing method that heats liquids, such as milk or juice, to temperatures above 135°C (275°F) for a short period. This process effectively kills harmful bacteria and extends the shelf life of the product without the need for refrigeration until opened. UHT processing is commonly used in the dairy industry, particularly for products like UHT milk, which can last several months on the shelf. This technology allows for convenient storage and transportation, making it popular in regions with limited refrigeration facilities.