Caulking is a gooey substance that grown-ups use to seal cracks and gaps around doors, windows or walls in a house so that no air or water gets in. It's like putting a band-aid on a cut to keep the germs out.
Caulking can be made from different materials like silicone, acrylic, or rubber. It usually comes in a tube like toothpaste and is squeezed out of the tube with a caulking gun or your hand.
Before caulking, grown-ups should clean the area they want to seal with soap and water, let it dry, and then use a special tool or their finger to spread the caulking out evenly. They should make sure the caulking fills the entire gap, and then wipe away any excess caulking with a damp cloth.
Once the caulking dries, it becomes hard and prevents air or water from coming in. That's how caulking keeps your house warm and dry, just like a big blanket keeps you warm and cozy in bed.