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I was reading one of the questions in stackoverflow and I saw THIS ANSWER.
At the beginning of the answer I saw this sentence at the first line :

Expression: Something which evaluates to a value. Example: 1+2/x

My problem is, what does the sentence mean when it says "evaluate to something" ?

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When we evaluate an expression we determine the value it has under certain circumstances. If we want to evaluate 1 + 2/x we would usually know the value of x. Suppose in fact the value of x is 0.5 then the expression evaluates to 5.

Outside of the mathematical context evaluate has a similar meaning but slightly different. You might say He evaluated the discussion highly without any suggestion that he gave it a numerical value.

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