A First Aid Kit is an organized collection of medical supplies and equipment for providing initial care in emergency situations, available in various sizes and configurations for home, workplace, vehicle, travel, and specialized applications. Kits range from personal pouches (0.5-2 L) to comprehensive workplace cabinets (5-35 L) with soft-sided bags, hard cases, or wall-mounted containers. Contents are typically organized to meet regional standards (ANSI/ISEA Z308.1, CSA Z1220, BS 8599, DIN 13157/13169) and include wound care supplies (bandages, gauze, tape), antiseptics, burn care, eye care, emergency items (CPR mask, cold packs, foil blanket), instruments (scissors, tweezers), and PPE (gloves). Class A kits provide minimum supplies for low-hazard workplaces; Class B kits offer expanded quantities for high-hazard environments. Primary clinical applications include immediate treatment of minor injuries (cuts, abrasions, burns, sprains), bleeding control, wound care, fracture immobilization, and emergency assessment. Essential safety equipment for every home, workplace, vehicle, and public facility, providing critical medical supplies until professional care arrives.