An expression is any valid JavaScript code that resolves to a value.
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This means, it's any JavaScript code that has an end result, for example:
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1 + 2
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typeof(4)
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new Date()
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2 * 4
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And the list goes on...
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Every one of these expressions, resolves to a value, for example:
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1 + 2 resolve to the number 3
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typeof(4) resolves to the primitive data type number
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new Date() resolves to a date object
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2 * 4 resolves to the number 8
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