Going to try and make this an extremely non technical answer.
So when people first started building houses, they had one big room. Sleeping, cooking, relaxing was done All in one shared space.
This was a vast improvement over no shelter at all, but it has limits. Someone moving around cooking is going to make it hard for the other person that might want to sleep, or the person sleeping might snore and disturb the person trying to read a book to relax.
So along comes the next improvement: Walls! Now one person can sleep, while another cooks, and another reads a book. It made the house more useful, because you can have multiple people doing different things, without getting in each other’s way.
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