What is Lead?
All of the lead in the universe came originally from inside stars.
Because lead has so much mass, people use it for weights and for bullets. The large mass gives it a lot of momentum. Lead is also very soft and doesn't corrode (rust) very much, so people use it for building, for instance to seal joints in roofs so the water doesn't get in. And people use lead to shield you from radioactivity, because the radioactive particles can't get through the big lead atoms. That's what's inside the heavy aprons they put on you at the dentist before taking x-rays, to protect the rest of your body from the radiation.
Bibliography and Further Reading about Lead: