There are 2 types of steam irons for home use on the market: corded and cordless. Corded models are the most widespread and efficient type. Although you can use them near the power outlet (to which it's connected) only, a lot of modern irons feature long cords so you are not limited in movements. Speaking of cordless models, they have a similar operation principle as electric kettles. Just like kettles, they need to be placed on special stations, then plugged in, and then, when the water in the tank is heated up, taken off for ironing. However, both corded and cordless steam irons feature pretty much the same capabilities and differ only in price.