The International Data Week (IDW 2021) is scheduled for 8–11 November 2021 in Seoul, South Korea, in a hybrid form, under the theme “Data to Improve our World.” Open Science and the FAIR Principles are important enablers of discovery and innovation, particularly the use of Big Data and Artificial Intelligence. The IDW 2021 is supported by the International Science Council’s Committee on Data (CODATA) and World Data System (WDS), and the Research Data Alliance (RDA).