Welcome dear child! So, you know about open source, don't you? Yes, that's when people from all over the world can collaborate to create a computer program without keeping it secret or earning money. But what happens after the program is finished and released to the world? That's when "post open source" comes into play.
Think of it like this, when you bake a cake, you mix all the ingredients, put it in the oven, and after it's ready to eat, you can share it with your friends and family. Similarly, when people create an open-source program, they put it on the internet for others to use and improve on.
Now, post open source is like when your cake becomes really popular with your friends, and they start experimenting with different flavors and adding their special ingredients to make it even better. Similarly, after the program is released, people can use it, tweak it, add new features to it, and customize it to meet their specific needs.
Many people work together to make sure the program works well for everybody, and they often share their changes with the original creators or the entire open source community. This way, the program keeps improving, and more and more people can use it.
In summary, think of open source as baking a cake, and post open source is like sharing the recipe with others so they can make it better and add their special touch. So, just like baking, collaborating together can make something truly great!