An anti-runway penetration bomb is a bomb that's designed to destroy an entire runway that planes take off and land on. Imagine a big, heavy metal box filled with explosives that's meant to dig into the ground and make a big hole in the runway.
When the bomb is dropped from a plane, it falls quickly towards the ground until it hits the runway. Then, it uses its strong, pointy nose to dig into the ground like a drill. As it goes deeper, the explosive inside the metal box starts to send shockwaves in all directions.
These shockwaves are very powerful and can break apart the runway, making it hard for planes to take off or land safely. The bomb is designed to make a big enough hole that it would take a lot of time and money to repair the runway, which would prevent enemy planes from quickly taking off or landing during a battle.
But it's important to note that this type of bomb is used for military purposes only and should never be used in regular life. It's important to respect the power and danger of explosives and to leave their use to experts who know how to use them safely.