A pencil is a writing tool that makes marks using a thin stick of graphite (a soft, dark mineral) encased in wood. When you press a pencil against paper, tiny bits of graphite rub off and stick to the surface, creating lines you can see.

The modern pencil was invented in the 1500s after a huge deposit of pure graphite was discovered in England. Before that, people wrote with quills dipped in ink or scratched letters into wax tablets. The pencil revolutionized writing because it was clean, portable, and didn't need to be dipped in anything.

Pencils are labeled with numbers and letters like 2B or HB that tell you how hard or soft the graphite is. A harder pencil (like 4H) makes lighter, crisper lines perfect for technical drawing. A softer pencil (like 6B) makes darker, smudgier marks that artists love for shading. The most common pencil, the #2, sits right in the middle and works well for everyday writing and filling in multiple-choice test bubbles.

One of the best things about pencils? Unlike pens, you can erase pencil marks. That makes them perfect for math homework, sketching ideas, or any time you might change your mind.