Space and time are often discussed together as "spacetime," reflecting their interconnectedness, particularly in the context of relativity. The speed of light, as established by Maxwell, is a constant that links space and time, leading to the formulation of Lorentz transformations by Einstein. This relationship demonstrates that while material objects follow classical velocity laws, light behaves differently, necessitating a unified framework. The suggestion to include velocity in the spacetime concept stems from recognizing that velocity is a critical factor in how space and time interact. Ultimately, the connection between space, time, and velocity is fundamental to understanding the nature of the universe.