Automotive Safety Integrity Level (ASIL) is a classification scheme defined by ISO 26262 that assesses automotive safety risks. It considers the severity, exposure, and controllability of potential vehicle hazards to determine an ASIL rating of A, B, C, or D. An ASIL D hazard poses the highest safety risk, with the potential for fatal injuries in conditions that are difficult for the driver to control. The ASIL rating influences the safety integrity requirements placed on automotive components and systems.