Abilities are the means through which players interact with the game world, dealing damage, defending allies, constructing turrets, changing hero mode or making use of special movement capabilities. Each hero has several abilities, including one Ultimate ability, an especially powerful ability which can only be used once the Ultimate Meter has been filled.
Abilities are the main difference between heroes. Abilities also define role, with Tanks having more defensive abilities, Defense heroes having construction or sniping abilities, Support heroes having more healing and augmenting abilities, and Offense heroes having more damaging and movement-enhancing abilities.
All heroes also have access to a basic melee attack, which could be considered a default ability.
Abilities are accessed through certain preset keys, primarily left-shift, Q, E, and the number keys ("trigger" and "bumper" buttons for console versions).