A Dobsonian telescope is a type of reflecting telescope that is known for its simple design and ease of use. It features a large, cylindrical tube that holds a primary mirror, which collects light and reflects it to a secondary mirror. This design allows for a wide field of view, making it ideal for observing celestial objects like planets and galaxies. The telescope is mounted on a sturdy, altazimuth base, allowing for smooth movement in both vertical and horizontal directions. This user-friendly setup makes Dobsonian telescopes popular among amateur astronomers, as they provide excellent light-gathering capabilities at an affordable price.