Smart glass, also known as switchable glass, is glass that can change its light transmission properties when voltage, light or heat is applied. There are several types of smart glass: liquid crystal glass allows light to pass through while providing privacy; low-E glass provides energy efficiency and blocks UV rays; thermochromic glass changes tint based on temperature; and electrochromic glass can be electrically tinted and maintains its tint without power. Smart glass provides benefits like easy cleaning, energy savings, UV protection, and doubling as a privacy screen. Its future includes increased cost efficiency, integration with other systems like HVAC, and adding other electronics and functions to the glass.