A Compact Fluorescent Lamp (CFL) is an energy-efficient lighting option that uses a gas-filled tube to produce light. Unlike traditional incandescent bulbs, CFLs consume less electricity and have a longer lifespan, making them a popular choice for both residential and commercial use. They are available in various shapes and sizes, often designed to fit standard light fixtures. 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 minimize environmental impact.