Ext2 is like a big box where your computer stores all of your files and folders. Think of it like a toy box, where you keep all your toys.
The difference between a toy box and Ext2 is that the toys in the toy box can be put in any order you want, but the things in Ext2 have to be put in a specific order so you can find them later. It's like putting your socks in one drawer and your shirts in another, so you can easily find what you need when you're getting dressed.
Ext2 also keeps track of all the toys (or files) in the box, so you don't lose any. This helps you find what you need faster and keeps everything organized.
So every time you save a new file on your computer, it gets put in the Ext2 box in its proper place. When you need to find that file later, Ext2 helps you quickly locate it in the box.
This is important because if all of your files were just thrown into a big pile, it would be impossible to find anything. Thanks to Ext2, you can easily find what you need when you need it!