HR AI applications span the full employee lifecycle from sourcing to offboarding. The highest-value use cases reduce time-to-hire, improve retention prediction, and automate high-volume repetitive work (resume screening, interview scheduling, onboarding documentation). Ethical deployment requires particular care around bias: hiring models trained on historical decisions can entrench past discrimination. EEOC guidelines in the US and emerging EU AI Act obligations around high-risk AI systems in employment context shape permissible use.