Ironing
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.