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Start with a question
A file extension hints at a format, such as .txt, .png or .cpp.
Let us build the idea one small step at a time.
See the idea
Use extensions as clues while remembering that the real content matters too.
Imagine the parts as helpers working together. Each part has a clear job and follows clear rules.
Connect it to a computer
In a real computer, data moves between programs, memory and hardware as bits. The example helps us understand the model, while the circuits and instructions do the real work.
Try a small example
Make a prediction, change one input and check the result. Explaining what changed is a powerful way to learn.
What to remember
Why Do Files Have Different Extensions? becomes easier when we connect a familiar example to the real computer model. Keep asking what goes in, what happens next and what comes out.