A steam iron is a household appliance designed 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. Most steam irons have adjustable temperature settings to accommodate different types of materials, such as cotton, silk, and polyester. They often feature a non-stick soleplate for easy gliding over clothes and may include additional features like a spray mist or vertical steam option for hanging garments.