A laser pointer is a small handheld device that emits a narrow beam of light, typically in the visible spectrum. It uses a laser diode to produce a focused light that can be seen over long distances. Laser pointers are commonly used in presentations, classrooms, and for various recreational activities, such as playing with pets. These devices come in different colors, including red, green, and blue, with green being the most visible to the human eye. Laser pointers are generally safe when used properly, but direct exposure to the eyes can cause damage. Always follow safety guidelines when using a laser pointer.