What is a pencil?

Hey all my new friends in this world....i`m written about the history of pencil maybe my description is can make you understood about pencil,,,,
because all of you dont understand about pencil and it history....

What is a pencil?

A pencil is a writing utensil usually constructed from a long, narrow. encased in a protective barrier. The casing traditional made from wood keeps the solid pigment inside from breaking and causing a mess on ones hands. Most pencil cores or there pigment is made from graphite that is mixed with clay, the clay acts as a binder. The point to the pigment is to leave a mark usually grey but can be darker....All of you know its came from slate in the past the humans of prehistoric and they used it for writted in cave......