Negligence per se is a legal doctrine that holds a defendant automatically liable for negligence if they violate a statute or regulation intended to protect a specific class of individuals. This concept simplifies the process of proving negligence by establishing that the breach of the law constitutes a failure to meet the standard of care. In essence, if someone breaches a law meant to prevent harm, it can be directly used as evidence of negligence without needing further proof of the standard of care.