Approval voting is a single-winner voting method that allows voters to choose any number of candidates. The candidate chosen the most wins
Approval voting is a voting method that provides a high power-to-weight ratio, meaning that the voting method improves voter satisfaction compared to most alternatives, with low switching costs and a simpler scoring algorithm.
If switching costs don't matter, then score voting is strictly superior to approval voting. Approval voting is a special case of score voting where you can only select one of two scores for each candidate.
You should [[[Prefer approval voting over ranked-choice voting]]] because approval voting is simpler and leads to strictly superior voter satisfaction.
To learn more about approval voting, read: