Understand bits, bytes, and how different data types represent numbers, text, and more
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A data type tells the computer how to interpret bits.
The bits 01000001 could mean:
Same bits, different meaning. Data types are the label on the container that says "interpret these bits as a number" or "...as text."
Test your understanding with this quiz.
Why do banking systems store money as integers (cents) rather than floats (dollars with decimals)?
Complete this exercise and get AI-powered feedback.
Every app makes data type decisions that affect scaling. Instagram, YouTube, Twitter—all hit limits because of early choices.
Train yourself to think: How big could this grow?