The value of 300,000 km/s is the speed of light in a vacuum. In this context, it is more appropriate to refer to it as the "speed" of light rather than its "velocity."
In physics, "speed" refers to the magnitude of the rate at which an object moves, while "velocity" refers to both the speed and the direction of motion. Since light always travels at a constant speed in a vacuum, its velocity is typically described as "the speed of light" without considering a specific direction.
It is important to note that the speed of light in a vacuum is a fundamental constant in physics, denoted by the symbol 'c.' In the International System of Units (SI), the value of the speed of light is approximately 299,792 kilometers per second (rounded to three significant figures).