A pinhole camera is a simple type of camera that uses a tiny aperture, or "pinhole," to capture images. It consists of a light-tight box or container with a small hole on one side and a photosensitive material, like film or photographic paper, on the opposite side. When light passes through the pinhole, it projects an inverted image of the outside scene onto the photosensitive surface. Pinhole cameras operate on the principle of camera obscura, where light travels in straight lines. They do not have lenses, which makes them easy to construct and use. The resulting images are often soft and have a unique aesthetic, making them popular among photography enthusiasts and artists.