Tin is a kind of metal that is soft and silver-colored. The most common use of tin today is in solder, the hot, liquid metal that holds pipes and other metal pieces together.
You may think of common items like tin foil and tin cans when you contemplate the uses of tin. Actually, so-called tin cans and tins are made of steel or other metals that are coated in tin. Before the middle of the 20th century, the foil used for covering food was made of thin sheets of tin. It was stiffer than today's foil (which is made of aluminum), and left food with a metallic, "tinny" taste.