Light is a form of electromagnetic radiation visible to the human eye, traveling at approximately 299,792 kilometers per second. It exhibits wave-particle duality, behaving both like waves and particles called photons. Light is essential for processes like photosynthesis, enabling plants to convert sunlight into energy, which sustains life on Earth. It also plays a crucial role in photography, communication through fiber optics, and medical technologies like laser surgery. Understanding light enhances our grasp of the universe and drives innovation across various fields.