So imagine you have two different kinds of Lego blocks: the big ones and the small ones. When you play with the big ones, you build big things like houses, cars, and castles. When you play with the small ones, you can build small things like animals, flowers, and tiny vehicles.
Now, let's say you want to build something that has both big and small pieces, like a spaceship. You can't use just one type of Lego block, because the spaceship will either be too big or too small. So, you need to use both the big and small Lego blocks together.
This is kind of like how dual topology works. In a computer network, there are two different kinds of connections: one for fast data transfer (like the big Lego blocks) and one for more stable connections (like the small Lego blocks).
Just like how you need both big and small Lego blocks to build a spaceship, you need both kinds of connections to make sure your computer network is working properly. Dual topology helps make this happen by allowing the network to use both kinds of connections at the same time.
So, dual topology is like having two different types of Lego blocks that you need to use together to build something cool, and in a computer network, it helps make sure everything works properly by using both fast and stable connections.