A tattoo machine is a device used by tattoo artists to create permanent designs on the skin. It works by using a needle that punctures the skin and injects ink into the dermis layer. There are two main types of tattoo machines: coil machines, which use electromagnetic coils to drive the needle, and rotary machines, which use a motor to move the needle. Tattoo machines come in various sizes and configurations, allowing artists to customize their tools for different styles and techniques. Proper maintenance and hygiene are essential to ensure the safety and quality of the tattooing process.