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Variables hold values like names, numbers, or results that can change.
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let declares a variable limited to the current block or function.
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const defines data that never changes during execution.
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var declares a variable function-wide, used before ES6.
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JavaScript has strings, numbers, booleans, arrays, and objects.
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Strings store characters inside quotes, like "Hello World".
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Numbers include integers, decimals, and negatives.
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Booleans store logic results for decisions.