Mirrorless cameras are a type of digital camera that do not use a mirror mechanism, unlike traditional DSLRs. This design allows for a more compact and lightweight body, making them easier to carry and handle. They use electronic viewfinders or the camera's LCD screen to display the image, providing a real-time preview of the shot. These cameras typically offer interchangeable lenses, similar to DSLRs, giving photographers flexibility in their shooting options. With advancements in technology, many mirrorless models now feature fast autofocus systems and high-quality image sensors, making them popular among both amateur and professional photographers.