A fluorescent bulb is a type of light source that uses electricity to excite mercury vapor, producing ultraviolet light. This light then interacts with a special coating on the inside of the bulb, creating visible light. Fluorescent bulbs are known for being energy-efficient and long-lasting compared to traditional incandescent bulbs. These bulbs come in various shapes and sizes, making them suitable for different settings, from homes to offices. They are often used in ceiling fixtures and desk lamps because they provide bright, even lighting. Additionally, using fluorescent bulbs can help reduce electricity bills and lower environmental impact.