The AK-130 is a really big and powerful gun that is usually found on big ships, like warships or submarines. It's like a giant water gun, but instead of water, it shoots massive bullets that can go really far and cause a lot of damage.
The AK-130 has two barrels that can rotate, which means it can shoot in different directions quickly. It's also controlled by really smart computers that help the people using it to aim and shoot accurately.
It's important because it helps protect the big ships from other ships or things that might try to attack them. The AK-130 makes it so the big ships can defend themselves and stay safe while they're out on the water.