Matchups denote the situations a unit performs best in. A unit counters another unit if it easily wins against that unit. It hard counters a unit if it completely dominates that unit, with little threat to itself, even against massed numbers. It soft counters a unit if it usually wins in relatively even numbers (by cost), especially in a massed battle. Air-to-ground units always counter ground units without a ground-to-air attack, but they are included for completion's sake. Matchups can be dictated by a number of factors, including attack types, cost, speed or cooldown, armor, size.