Ability Check
A roll to see if a character succeeds at a task, like picking a lock or spotting a hidden door.
An ability check tests whether an attempt works. You roll, the app adds the right modifiers (an ability, plus training in a skill or tool), and the total is compared with a Difficulty Class (DC). Searching, picking locks and haggling are all checks.
In Fantasy RPG
Fantasy RPG: d20 + the skill bonus (ability modifier, plus the proficiency bonus when trained) or the plain ability modifier. Meet or beat the DC to succeed.