The scalar quantity speed indicates how quickly an object is travelling. Its definition is the speed at which an object travels, or the distance covered in a given amount of time. Speed solely considers the magnitude of an object's motion; it ignores direction.
Speed VS Velocity:
In physics, speed and velocity are two different but related ideas. Regardless of direction, speed is a scalar variable that expresses how quickly an object is travelling. In contrast, velocity is a vector quantity that encompasses both speed and motion direction.