ISO is the International Organization for Standardization that sets standards for products, services, and systems to ensure quality, safety and efficiency. ISO 9000 provides quality management standards for companies, including requirements for documentation, implementation, and maintenance of quality systems. Certification requires an audit to ensure compliance. ISO 14000 provides environmental management standards for companies to minimize pollution and waste. While voluntary, certification can improve a company's public image, customer satisfaction, and access to international markets.