Dangerous goods are substances that pose risks due to their chemical or physical properties. They exist in solid, liquid, or gas forms and include radioactive, flammable, explosive, corrosive, oxidizing, toxic, and allergenic materials. The International Maritime Dangerous Goods Code provides guidelines for safely transporting dangerous goods by sea. It aims to enhance safety, protect the environment, and facilitate movement of goods. Dangerous materials are classified into 9 classes, including explosives, gases, flammable liquids and solids, oxidizers, toxics, and corrosives. Shipping agents are responsible for handling shipments on behalf of owners, coordinating with ports, and ensuring documentation and supplies are in order.