Compact fluorescent lamps (CFLs) are energy-saving light bulbs that use a gas-filled tube to produce light. They are designed to replace traditional incandescent bulbs, using about 70% less energy and lasting up to ten times longer. CFLs come in various shapes and sizes, making them suitable for different fixtures. These lamps 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. CFLs are available in different color temperatures, allowing users to choose between warm or cool lighting for their spaces.