The Simplest Definition of Light

Light is a form of energy that enables us to see the world around us. It is a type of electromagnetic radiation that is visible to the human eye, typically ranging in wavelength from about 380 to 750 nanometers. Light travels in waves and can move through a vacuum at a constant speed of approximately 299,792 kilometers per second, known as the speed of light. It exhibits both wave-like and particle-like properties, a duality that is fundamental to our understanding of physics. In everyday terms, light is what illuminates our surroundings, allowing us to perceive colors, shapes, and distances.