A neon sign is a type of illuminated sign made from glass tubes filled with neon gas or other gases. When an electric current passes through the gas, it emits a bright, colorful light. These signs are often used for advertising, decoration, and artistic displays due to their vibrant colors and eye-catching designs. Neon signs became popular in the early 20th century and are commonly associated with urban environments and nightlife. They can be found in various shapes and sizes, often featuring text or images that convey messages or attract attention. Neon signs are a unique blend of art and technology.