A "knot" is a method of fastening or securing a length of material, typically rope or string, by intertwining it in a specific way. Knots are used in various applications, including sailing, climbing, and crafting, to create loops, ties, or bindings. Each type of knot has its own unique structure and purpose, making it essential to choose the right one for the task at hand. Knots can also refer to a unit of measurement for speed, particularly in maritime and aviation contexts. One knot is equivalent to one nautical mile per hour, which is approximately 1.15 miles per hour. This measurement is crucial for navigation and helps ensure safe travel over water and in the air.