There are two types of advantage in chess, Material advantage and positional advantage. Material advantage is easy, that’s who has more pieces. Positional advantage is harder to quantify but it’s who has their pieces in better spots, controlling more of the board and having more pieces developed (able to freely move around the board and not stuck behind pawns). The computer looks for the move that increases both ther material and positional advantage the most. They will even look ahead a certain number of moves depending on the time constraints and power of the computer and create what is called a markov chain (which is a ELI5 on it’s own) that will measure the strength of a move into the future not just in the current board configuration.
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