Cardstock is thick, sturdy paper that's heavier and more durable than regular writing or printer paper. When you hold a piece of cardstock, you can feel the difference immediately: it doesn't flop over like notebook paper, and it's harder to accidentally tear or crumple.

People use cardstock when they need paper that will hold up to handling or display. Greeting cards, postcards, and business cards are typically printed on cardstock. Teachers often print certificates or classroom decorations on cardstock so they last longer. If you're making a bookmark, a paper airplane that needs to be extra sturdy, or a homemade playing card, cardstock works much better than regular paper.

The thickness of cardstock is measured in weight or point size. Heavier cardstock feels almost like thin cardboard, while lighter cardstock might be only slightly thicker than regular paper. Art supply stores sell cardstock in many colors, making it popular for craft projects, scrapbooking, and school presentations where you want something that looks professional and sturdy.