Compact fluorescent lamps (CFLs) are energy-efficient light bulbs that use a small amount of electricity to produce light. They contain a gas that emits ultraviolet light when electrified, which then excites a fluorescent coating inside the bulb to create visible light. CFLs consume about 70% less energy than traditional incandescent bulbs and can last up to ten times longer. These lamps are available in various shapes and sizes, making them suitable for different fixtures. CFLs are often used in homes and businesses to reduce energy costs and lower greenhouse gas emissions. However, they contain a small amount of mercury, so proper disposal is important.