The pencil is one of the simplest tools in your pencil case, but it has an interesting history. It all began in England in the 1500s, when people found a large amount of a soft black material in the ground. They thought it was lead, a heavy gray metal, so they called it "black lead". In fact, it was graphite.
Graphite left dark marks on paper, but it was soft and broke easily, and it made people's hands dirty. At first, people wrapped pieces of it in string. Later, they put it inside thin pieces of wood, which made it much easier to hold.
A big change came at the end of the 1700s. A French inventor, Nicolas-Jacques Conté, mixed graphite powder with clay and baked it. By using more clay or less clay, he could make pencils harder or softer. Many pencils today are still made in a similar way.
In the 1800s, an American added a small eraser to the end of the pencil. Not everyone liked the idea, and many pencils are still sold without one.
Here is a surprising fact: there has never been any lead in a pencil. Yet in English, people still talk about "pencil lead". Old names, like old tools, can last a very long time.