Heat-strengthened glass is a type of glass that is less strong than toughened glass, but still has increased resistance to thermal stresses compared to annealed glass. It is made by heating the glass to a high temperature and then cooling it slowly, which creates surface compression that gives the glass its strength. Heat-strengthened glass is typically used in applications where increased strength is desired, such as in architectural windows and facades, and it is often used in combination with laminated glass for enhanced safety and security. Unlike toughened glass, heat-strengthened glass does not shatter into small pieces when it breaks, but instead breaks into larger, jagged pieces.