What is the difference between caulk and wood putty?

Caulk is a flexible sealant used to fill gaps and cracks around Windows, doors, and other areas where air or moisture might enter, typically made from materials like silicone or latex. Wood putty, on the other hand, is a thicker, more solid compound used to fill holes, dents, or imperfections in wood surfaces, and it hardens after application. While caulk remains pliable and is often used for waterproofing, wood putty is designed for sanding and painting to achieve a smooth finish.