ISO/IEC 17021 is an International standard that gives a lot of prerequisites which must be trailed by a Management System Certification Body to ensure that the Certification procedure did is fair, vital, reliable and is done by an equipped individual.
The Assessments done by the certify accreditation bodies according to different administration framework gauges, for example, ISO 9001, ISO 14001, ISO 45001, ISO 37001, and so on will give benefits and offer some incentive to a wide range of associations.

ISO/IEC 17021 Conformity Assessment — Requirements for bodies giving review and certification of the management systems, as it is formally called, was set up by the ISO Committee on Conformity Assessment (CASCO) in 2006. It was created to satisfy the need to have an International Standard that could encourage the acknowledgment of bodies that were performing Conformity Assessments and the acknowledgment of their certifications on a national and global premise; making it simpler to perceive the Management System Certifications in light of a legitimate concern for universal exchange.

ISO 17021 is an International Standard that gives Certification Bodies (CB) with a lot of necessities that will empower them to guarantee that their administration framework(such as Quality management system, Environmental management system etc.) certification process is carried out in a competent, consistent and impartial manner.