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How does a computer work?

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Quick answer

A computer works by representing everything as binary (0s and 1s) and processing it with a central processing unit (CPU) that follows instructions step by step. Input, processing, memory, and output work together to run programs. All data and instructions are stored as binary.

Step by step

  1. All data and instructions are stored as binary.
  2. The CPU fetches, decodes, and executes instructions billions of times per second.
  3. Memory (RAM) holds what's in use; storage keeps data long-term.
  4. Input devices feed data in; output devices show results.

People also ask

What does the CPU do?
It's the 'brain' — it fetches instructions, decodes them, and carries them out, doing arithmetic and logic at enormous speed.
What's the difference between RAM and storage?
RAM is fast, temporary working memory; storage (like an SSD) keeps data permanently even when powered off.
Why do computers use binary?
Their circuits reliably represent two states (on/off), which map directly to 1 and 0.