Sure! Imagine each popcorn kernel as a tiny container filled with a little bit of water and a little bit of oil, as well as some starch inside. When you put the popcorn in the microwave and heat it up, the water inside the kernel turns into steam because of the heat. This steam builds up pressure inside the kernel, like blowing up a balloon.
Now, when the pressure inside the kernel gets too high, it needs to escape somewhere. That's when the kernel pops! The pressure inside pushes against the hull (the hard shell of the kernel), and when it gets too much, the hull breaks open. When it breaks, the steam inside expands rapidly, making the kernel turn inside out and causing it to pop into that fluffy, delicious popcorn you love to watch!
So, basically, it's the combination of heat, water turning into steam, and the pressure building up inside the kernel that makes popcorn pop! It's like a tiny explosion happening in each kernel, turning it into the tasty treat you enjoy.