A standard is a technical document designed to be used as a rule, guideline, or definition. Standards are published documents that establish specifications and procedures designed to ensure the reliability of the materials, products, methods, and/or services people use every day. They are fundamental building blocks for product development by establishing consistent protocols that can be universally understood and adopted.
Standards are created by bringing together all interested parties such as National organizations, Professional Societies, Manufacturers, Consumers, and Regulators of a particular material, product, process, or service.
All parties benefit from standardization through increased product safety and quality; and lower transaction costs and prices—ensuring product functionality and compatibility, facilitating interoperability, and supporting safety.
In summary, standards fuel the development and implementation of technologies that influence and transform the way we live, work, and communicate.
Sources: http://standards.ieee.org/ and http://www.cen.eu
ASTM Digital Library: The ASTM Standards and Engineering Digital Library is a vast collection of industry-leading standards and technical engineering information. The Library covers a broad range of engineering disciplines, including aerospace, biomedical, chemical, civil, environmental, geological, health and safety, industrial, materials science, mechanical, nuclear, petroleum, soil science, and solar engineering.
IEEE Standards: IEEE Standards contains around 4,000 technical standards from more than 30 topics covering active, revised, archived, and draft standards.
SAE Digital Library: SAE International is the world's largest industry association dedicated to the automotive, aerospace, and commercial vehicle sectors. SAE Digital Library contains standards for safety and quality of products.
American National Standards Institute (ANSI): The American National Standards Institute is a private non-profit organization that oversees the development of voluntary consensus standards for products, services, processes, systems, and personnel in the United States.
CEN from European Union Countries: CEN's National Members are the National Standards Organizations (NSOs) of the European Union countries, plus three countries of the European Free Trade Association (Iceland, Norway, and Switzerland). There is one member per country.
SASO from KSA: Search the Catalogue of "Saudi Standards, Metrology and Quality Organization (SASO)," the sole standardization body in the Kingdom.
Some commercial standards stores provide free catalogue searching (full text download requires payment).