A supply chain is a system of organizations and activities involved in moving products from suppliers to customers. It involves planning, implementing, and controlling operations to satisfy customer needs efficiently. Supply chain management coordinates planning and logistics activities like sourcing, manufacturing, and distribution with partners. When implemented properly, it helps businesses increase revenue, utilize assets better, and reduce costs through strategic areas like fulfillment, logistics, production, and inventory management. However, the bullwhip effect can magnify variability in demand as it moves up the supply chain.