A DSLR, or Digital Single-Lens Reflex camera, is a type of digital camera that uses a mirror mechanism to reflect light from the lens to an optical viewfinder. This allows photographers to see exactly what the lens sees, making it easier to compose shots. DSLRs typically offer interchangeable lenses, giving users the flexibility to choose the best lens for different situations. DSLRs are popular among both amateur and professional photographers due to their high image quality, manual controls, and performance in low-light conditions. They often feature larger sensors compared to point-and-shoot cameras, which contributes to better image clarity and detail.