An iron

Ironing means getting the creases out of clothes after they have been washed and dried. Ironing is done with a tool called an "iron". It is called an iron because in past centuries it was made of iron, a type of metal. The iron is heated before it is used. This used to be done by putting the iron on a fire. Nowadays electricity is used to warm the iron. The user can put water inside, which becomes steam.