A white noise machine is a device that produces a consistent sound, often resembling the hum of a fan or static from a radio. This steady noise helps to mask other sounds in the environment, making it easier for people to sleep, concentrate, or relax. Many people use these machines to drown out distractions like traffic, barking dogs, or loud neighbors. These machines come in various forms, including portable models and those designed for use in a nursery for babies. Some even offer different sound options, such as nature sounds or ocean waves, allowing users to choose what they find most soothing.