A mechanical keyboard is a type of computer keyboard that uses spring-activated switches instead of rubber domes to register key presses. Unlike membrane keyboards, which use rubber domes that collapse under pressure, each key on a mechanical keyboard has its own switch underneath, which is responsible for registering key presses. This means that mechanical keyboards provide a more tactile and responsive typing experience, and are more durable and easier to repair than membrane keyboards.

Mechanical keyboards are used primarily for typing, gaming, and programming, although they have applications in music production, graphic design, and other fields. They offer special features that are important to gamers, such as "rollover," which means that even if you press multiple keys simultaneously, all the inputs are sure to go through. Mechanical keyboards also allow for customization in look and feel, and they come in different sizes and layouts.

Mechanical switches come in three main varieties: linear, tactile, and clicky. Linear switches have a smooth keystroke with no tactile feedback, while tactile switches provide a bump or click when the key is pressed. Clicky switches provide an audible click in addition to the tactile feedback.

Overall, mechanical keyboards are appreciated by fast typists and gamers because they offer a springiness and feel that is not the same as the low-cost membrane keyboard accompanying most computers. They are also easier to clean, repair, and customize, and provide a more enjoyable typing experience.