Lockout/Tagout (LOTO) is a regulated safety procedure designed to prevent unexpected energization, startup, or release of stored energy during equipment maintenance or servicing. It applies to all hazardous energy sources—electrical, mechanical, hydraulic, pneumatic, chemical, thermal, and potential energy—across industrial and manufacturing environments. The process involves identifying energy sources, isolating them using approved devices (e.g., circuit breakers, valves), applying personal locks and standardized tags, verifying isolation, and safely re-energizing equipment after work is complete. OSHA 29 CFR 1910.147 mandates a written LOTO program tailored to each piece of equipment, requiring training for authorized employees and clear communication with affected personnel. Lockout devices must be tamper-resistant and individually assigned; tagout alone is insufficient for protection. The procedure is a multi-step, enforceable system that ensures worker safety by physically preventing re-energization until all hazards are confirmed cleared. Effective implementation depends on proper training, consistent enforcement, appropriate tools, and a strong safety culture. LOTO is not optional—it is a critical component of occupational safety, aligned with international standards such as GB/T 44686-2024, and essential for preventing serious injury or death during maintenance operations.