You are probably wondering why this guy is writing an article on this. Is this some AI slop or what? They keep asking this question in interviews; it is our duty to put it out there and flood the internet with it until everyone easily understands it. Besides, people have different ways of understanding different concepts. So after reading this article, go out there and write about it in your own words. The internet needs more of that. The candy store door vs the candy aisle Authentication is the candy store door. There's a guard at the entrance who checks your ID before letting you in. No ID, no entry. It does not matter how much you want the candy; you need to prove who you are first. Authorization is the candy aisle. You're inside the store now, but that doesn't mean you can go everywhere. Customers stay in the aisles. The stockroom? Staff only. The manager's office? Don't even think about it. Where you're allowed to go depends on who you are, and that's authorization .…