What is the difference between a refractor telescope and a reflector telescope?

A refractor telescope uses lenses to focus the light into an image where a reflector telescope uses mirrors. Reflector telescopes are generally better for visual viewing of brighter celestial objects like the moon or planets and can collect more light due to their larger apertures. Refractor telescopes provide better contrast and image quality but collect less light which makes them more suitable for astrophotography where exposure time can be adjusted to compensate.