Baldur's Gate 3 often has players roll a D20 to determine if they pass or fail a skill check. While there is a lot of randomness to those rolls, proficiency will add to that roll to increase your odds of passing the skill check.
Baldur’s Gate 3: Proficiency Explained
Baldur's Gate 3 is built around dice rolls, much like DND. Proficiency refers to a positive effect on your dice rolls, but there's a bit more to it.
