A modular rocket is like building with Legos! Rockets are made up of lots of parts like engines, fuel tanks, and control systems. But instead of having to build them all at once, like building a jigsaw puzzle, a modular rocket lets you build each part separately and then connect them together when you're ready to launch.
Think of it like building a tower of blocks. If you want a taller tower, you can add more blocks to the bottom or the top. A modular rocket is the same way. You can add more fuel to make it go farther or add more engines to make it go faster. But you don't have to build a whole new rocket from scratch.
Modular rockets are great because they are more flexible and can be customized for different missions. For example, a small rocket might only need one engine and a small fuel tank, while a big rocket might need several engines and huge fuel tanks.
And, if one part of the rocket isn't working quite right, you can easily replace just that part without having to rebuild the entire rocket.
Overall, a modular rocket is an efficient and flexible way to build rockets for space exploration and other missions.