Authentication vs Authorization — What's the Difference?
Understanding the difference between who you are and what you can do, with the hotel key analogy
These two words sound almost identical, and people use them interchangeably all the time. But they mean completely different things, and confusing them is one of the most common sources of security bugs in web applications.
Let's fix that confusion permanently.
The Hotel Key Analogy
Imagine you check into a hotel.
Authentication is the front desk verifying your ID and giving you a room key. They confirm that you are who you say you are. "Yes, this is the person who booked room 412."
Authorization is the key only opening room 412 — not room 413, not the staff room, not the pool after hours. It controls what you're allowed to access.
Both are essential, and they're different problems:
| | Authentication | Authorization | |---|---|---| | Question it answers | Who are yo
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