A Cassegrain telescope is a type of reflecting telescope that uses a combination of mirrors to gather and focus light. It features a large primary mirror that collects light and reflects it to a smaller secondary mirror. This secondary mirror then directs the light through a hole in the primary mirror, allowing for a more compact design. Cassegrain telescopes are popular among amateur and professional astronomers due to their ability to produce high-quality images while maintaining a shorter physical length. They are often used for observing celestial objects, such as planets and stars, and can be equipped with various accessories for enhanced viewing.