It indicates who has an advantage in material or position. A positive number means White is ahead a negative number means black is ahead. "0" is a tie. You can think of a score of "1" being something like "1 pawn ahead"
Computer Analysis
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+ numbers are better for white, - numberes are better for black
In the little box where the computer analysis tells when there is a mistake, inaccuracy or blunder, there is always a number. What does the number mean?