Certification and Accreditation (C&A or CnA) is a process for implementing any formal process. It is a systematic procedure for evaluating, describing, testing, and authorizing systems or activities prior to or after a system is in operation. The process is used extensively across the world.
Certification is a comprehensive evaluation of a process, system, product, event, or skill, typically measured against some existing norm or standard. Industry and/or trade associations will often create certification programs to test and evaluate the skills of those performing services within the interest area of that association. Testing laboratories may also certify that certain products meet pre-established standards, or governmental agencies may certify that a company is meeting existing regulations (e.g., emission limits).
Accreditation is the formal declaration by a neutral third party that the certification program is administered in a way that meets the relevant norms or standards of certification program (e.g., ISO/IEC 17024).
Many nations have established specific bodies.
In the United Kingdom, for example, an organization known as United Kingdom Accreditation Service (UKAS) has been established as the nation's official accreditation body. Most European nations have similar organizations established to provide accreditation services within their borders.
There is no such "approved" accreditation body within the United States, however. As a result, over the years multiple accreditation bodies have become established to address the accreditation needs of specific industries or market segments. Some of these accreditation services are for profit entities, however the majority are not-for-profit bodies that provide accreditation services as part of their mission.