photon

A photon is a fundamental particle of light and all other forms of electromagnetic radiation. It carries energy and travels at the speed of light, which is about 299,792 kilometers per second. Photons have no mass and do not carry an electric charge, but they are essential for processes like photosynthesis in plants and vision in animals. They can behave both like particles and waves, a concept known as wave-particle duality. Essentially, photons are the basic units that make up light and play a crucial role in various phenomena in physics and technology.