A GU10 smart bulb is a type of light bulb that uses the GU10 socket, which is commonly used in Europe and other countries. It is a bi-pin socket that is typically used in track lighting and recessed lighting fixtures. GU10 smart bulbs are compatible with smart home systems and can be controlled using a smartphone app or voice commands. They can change colours, brightness, and temperature, and can be scheduled to turn on and off automatically.