A steam flat iron is a hair styling tool that combines the features of a regular flat iron with the added benefit of steam. It has a water reservoir that produces steam when heated, which helps to hydrate and protect the hair as it's straightened. The steam helps reduce frizz, adds shine, and makes the straightening process more efficient, especially for thick, curly, or coarse hair.The device typically has ceramic or titanium plates that glide over the hair, and the steam emitted softens the hair, making it smoother and more manageable. Many steam flat irons come with adjustable temperature settings and steam levels to suit different hair types.