Long exposure is a photography technique that involves using a slow shutter speed to capture light over an extended period. This allows for the creation of images that can show movement, such as flowing water or moving clouds, resulting in a smooth and ethereal effect. Photographers often use a tripod to keep the camera steady during the long exposure, preventing blurriness from camera shake. This technique is commonly applied in landscape photography, especially during dawn or dusk, to enhance the colors and details in the scene, making it a popular choice for capturing the beauty of nature.