What is the speed of light in a vacuum?

The speed of light in a vacuum is approximately 299,792,458 meters per second (m/s). This constant is denoted by the symbol "c" and represents the maximum speed at which information or energy can travel in the universe according to the theory of relativity proposed by Albert Einstein. The speed of light is a fundamental physical constant and is a key parameter in various scientific and technological contexts, including physics, astronomy, and telecommunications. The value of 299,792,458 m/s is often rounded to 300,000 kilometers per second for simplicity in calculations.