Smart glass, also known as switchable glass, includes various technologies that control light and heat transmission. Electrochromic glass darkens or lightens when voltage is applied, while thermochromic glass reacts to temperature changes. SPD (Suspended Particle Device) glass adjusts tint through suspended particles activated by electricity. PDLC (Polymer Dispersed Liquid Crystal) glass switches from transparent to opaque for privacy. Laminated glass is made of multiple layers for safety and soundproofing. Low-E coating is a thin metallic layer that reflects heat, improving energy efficiency. UV protection refers to glass that blocks harmful ultraviolet rays. Smart tint is a retrofit film offering similar features without replacing glass entirely.