Codes and standard can be defined as a set of technical definitions and guidelines that function as instructions for designers, manufacturers, operators, or users of equipment. Depending on the subject, a standard can run from a few pages to hundreds of pages, and is written by professionals in a particular technical field, who serve on a standard developing organization committee.
Standards, not having the force of law, are considered voluntary and serve as guidelines. Standard developing organization publishes standards and codes and accredits users of standards to ensure that they are meeting those standards.