What makes popping corn pop?

Popping corn is a type of maize (corn) kernel that expands and turns inside out when heated. This occurs due to the presence of moisture inside the kernel and the hard, non-porous outer shell. When the kernel is heated, the moisture inside turns to steam, building pressure within the kernel. As the pressure increases, the endosperm (the starchy part) of the kernel softens, while the outer shell remains hard and brittle. Eventually, the pressure becomes so great that the kernel ruptures, causing the endosperm to expand rapidly and turn the kernel inside out. This is what gives popped corn its characteristic shape and crispy texture.