A compact fluorescent lamp (CFL) is an energy-efficient light bulb that uses a gas-filled tube to produce light. Unlike traditional incandescent bulbs, which generate light by heating a filament, CFLs use an electric current to excite the gas, resulting in illumination. They consume about 70% less energy and last up to ten times longer than incandescent bulbs, making them a popular choice for environmentally conscious consumers. CFLs come in various shapes and sizes, designed to fit standard light fixtures. They emit a soft, warm light similar to that of incandescent bulbs, but they can take a moment to reach full brightness. While they contain a small amount of mercury, proper disposal is essential to minimize environmental impact.