A steam iron is a household appliance used to remove wrinkles from fabric. It works by heating water in a reservoir, which then produces steam. This steam is released through small holes in the iron's soleplate, helping to relax the fibers of the fabric and making it easier to smooth out creases. Steam irons come in various designs and features, including adjustable temperature settings for different types of fabric, such as cotton and polyester. Some models also have a vertical steam option, allowing users to steam hanging garments or curtains. Regular use of a steam iron can help maintain a neat and polished appearance in clothing.