A ray is a straight line that starts at a point and extends infinitely in one direction. You can think of it like a sunbeam shining out from the sun. Rays are often used in geometry to help explain angles and shapes. They are important in understanding how light travels and how we see objects around us. In everyday life, rays can be seen in various forms, such as the light rays that come from a flashlight or the laser rays used in technology. Understanding rays helps us grasp concepts in physics, like how light behaves when it hits different surfaces, creating shadows and reflections.