Understand why computers count in binary and how hexadecimal makes binary readable for humans
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Your brain uses 10 fingers. Computers use switches.
A light switch has 2 states: ON or OFF. Nothing in between. Computers are built from billions of these switches, so they count in base-2 (binary) instead of base-10 (decimal).
0 = OFF, 1 = ON. That's it. Every number, every photo, every song—just patterns of switches flipping on and off.
Test your understanding with this quiz.
Your friend says 'hex is pointless—computers work in binary anyway.' What's the real reason developers use hexadecimal?
Complete this exercise and get AI-powered feedback.
Now that you understand binary and hex, you'll see them everywhere in tech.
Recognition is the first step to innovation. What patterns can you spot?