Okay kiddo, when a building gets really old, sometimes it needs to be fixed up. Reconstruction is like fixing up a really old building, but making it look new again.
First, people have to make a plan. They look at pictures of what the building used to look like and decide how they want to make it look new again. Then, they get all the materials they need to fix up the building. They might use special tools like hammers and nails, or big machines like cranes.
Next, people start working on the building. Sometimes, they have to take parts of the building apart to fix them up. They might also add new parts to it to make it look really nice. Every day, they work really hard to make the building look beautiful again.
Once the building is all fixed up, people can go inside and use it again. Sometimes the building is used for offices, houses, or even stores! Everyone who goes inside the building thinks it's really cool and new, even though it's actually really old. And that's what reconstruction is all about!