When you buy a cake, can you just look at it to determine the recipe?
It’s the same thing.
The source code is text. It looks like a kind of math-english hybrid with lots of curly brackets all over the place.
The developers feed that to a special program, which reads it, and makes a program which behaves like the source code describes.
That program doesn’t contain the source code, but it was built from the source code.
Just like a cake doesn’t contain the recipe, but it is built from the recipe.
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