An overview of the current international standards on various thermophysical properties of water and steam, which have been prepared and authorized by the International Association for the Properties of Water and Steam (IAPWS), is presented. A long traditional international collaboration over 62 years in this field has been established throughout the International Conferences on the Properties of Steam (ICPS) which are used to be organized by the International Association for the Properties of Steam (IAPS), the former organization of the present IAPWS. The paper provides some brief historical reviews on the outstanding activities through the ICPS, IAPS and currently-existing IAPWS, which all have been achieved on the basis of international cooperations. Some detailed discussions on the existing documents such as Releases, Supplementary Release and Guidelines disseminated as a set of international standards on various thermophysical properties of water and steam by the IAPWS are included for aiming the extensive applications by the readers.