An automatic knife, also known as a switchblade, is a type of knife that opens automatically with the push of a button or lever. This mechanism allows the blade to spring out quickly, making it convenient for one-handed use. Automatic knives are often used in various applications, including outdoor activities and everyday carry. The legality of automatic knives varies by region, with some places imposing restrictions on their sale and possession. They are often associated with law enforcement and military use, but they are also popular among collectors and enthusiasts. Proper handling and safety precautions are essential when using these knives.