Compact Fluorescent Lamps (CFLs) are energy-efficient light bulbs that use a gas-filled tube to produce light. They consume less electricity than traditional incandescent bulbs, making them a popular choice for reducing energy costs and environmental impact. CFLs typically last longer, often up to 10,000 hours, compared to about 1,000 hours for incandescent bulbs. CFLs work by passing an electric current through a gas, which produces ultraviolet light. This light then interacts with a phosphor coating inside the bulb, creating visible light. While they are more efficient, CFLs contain a small amount of mercury, so proper disposal is important to prevent environmental contamination.