Certain actions may occasionally perform exceptionally well on random chance, often multiplying the expected effect quality/power (such as critical hit multiplying damage dealt).
Alternate names: Critical hits, Critical success chance
The first video game about Critical chance was released on December 2, 1994.
Most commonly appears in form of statistically occurring (% chance) critical hits which double the damage dealt or similar.
This is for all things having "critical chance", not just attacks or other damaging things.
* Locational damage - removes the statistical chance part of critical strikes.