Difference between sites and Certificates in ISO SURVEY

Answer: ISO 27001 certificates may be defined in terms of processes/services, organizational units or locations (the ISMS scope), and a single certification may cover multiple locations, also called sites. For example, you can have an organization's HQ and its filial covered by a single ISO 27001 certificate, resulting in one certification and two sites.

This article will provide you further explanation about differences regarding certification and other related ISO terms:
- Accreditation vs. certification vs. registration in the ISO world https://advisera.com/articles/accreditation-vs-certification-vs-registration-in-the-iso-world/