Relativistic effects refer to the phenomena that occur when objects or systems are moving at speeds comparable to the speed of light, as predicted by Albert Einstein's theory of relativity. These effects become significant when velocities approach a significant fraction of the speed of light, causing changes in the perception of time, length contraction, and mass increase. Relativistic effects have been extensively studied and confirmed through experiments in particle physics, astrophysics, and high-speed technology. Understanding and accounting for relativistic effects is crucial for accurately predicting and describing the behavior of objects and systems moving at high velocities.