What is the difference between "expression" and "value"?

[Worldwidebrine]

What is the difference between "expression" and "value"?
They are similar.
In my opinion, "expression" is the name before evaluation and "value" is the name after evaluation. Am I wrong?

[Josh-Cena]

You are right. 1 + 1 is an expression (namely, an additive expression consisting of two literal expressions), and its value is the number 2. 0xa is a literal expression whose value is the number 10.

(I actually planned to incorporate this explanation into the glossary entries a few days ago, just haven't started on it yet)