A DSLR camera, or digital single-lens reflex camera, is a type of digital camera that combines the optics and mechanisms of a single-lens reflex camera with a solid-state image sensor and digitally records the images from the sensor. It is a camera that operates with a fixed digital sensor, can autofocus, and hold thousands of photos on its internal memory card. DSLRs allow you to combine the camera body with lens attachments of your choice, whether that’s a fisheye or a zoom lens, making them versatile in terms of the types of lenses that can be used.

DSLRs are popular among both professionals and entry-level photographers because they offer professional photos with high image quality and can work with an array of interchangeable lenses. They are also lightweight and pair well with other lenses and attachments, making them a favorite camera choice for many photographers. DSLRs often have image sensors of much larger size and often higher quality, offering lower noise, which is useful in low light.

DSLRs work by use of a reflex mirror (or prism) that reflects light into the optical viewfinder, allowing the photographer to capture the image. The mirror can be fixed and semi-transparent in SLT-type (Single Lens Translucent) cameras or it can flip up during exposure (in SLRs and DSLRs) . DSLRs typically have fully automatic shooting modes, but they also require manual control of each button to bring the most out of them.

In summary, a DSLR camera is a type of digital camera that uses a single lens and a mirror system to capture high-quality images with great versatility. They are popular among both professionals and entry-level photographers because of their image quality, interchangeable lenses, and versatility.