Procfs is like a special folder that a computer has, where you can peek inside and see all the things that different programs on the computer are doing. It's like opening up a toy box and seeing all the toy cars, dolls, and blocks inside, except instead of toys, it's computer programs!
When you look inside the procfs folder, you'll see a bunch of files with numbers as their names. These numbers are actually the IDs of the different programs running on the computer. So if you see a file called "1234", that means it's the file for program number 1234.
Inside these files, you can see what the program is currently doing on the computer. You might see things like how much memory the program is using, what files it has open, or even information about what the program is currently doing in real time.
But don't worry, even though you can peek inside procfs and see what programs are doing, you can't actually change anything or make anything go wrong. It's just like looking through a window to see what's happening outside. You can see it, but you can't touch it or change it.