Memory management is like keeping your toys organized in your room. You have a limited space to keep your toys, just like how your computer has a limited amount of memory to store your apps and files.
Just like how you have to decide which toys to keep and which ones to give away when you don't have enough space, the computer also has to decide which apps and files to keep in its memory and which ones to move to a different part of the computer for safekeeping.
The computer does this by having a special program called a "memory manager" that organizes everything in the computer's memory. The memory manager keeps track of what apps are being used and which ones are not, and it moves them to different parts of the computer to make sure everything runs smoothly.
Sometimes the memory manager might even "clean up" some space by getting rid of older files or apps that you don't need anymore, just like how you can decide to give away some of your old toys to make space for new ones.
Overall, memory management is really important for keeping your computer running smoothly so that you can use all of your favorite apps and files without any problems.