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The Tara Pacific program involved a 2-year continuous scientific expedition at sea to reveal new facets of coral reef biodiversity in the Pacific Ocean. Using a coordinated approach to systematically sample coral reef ecosystems across the Pacific Ocean, this project aimed to provide a baseline of the complexity of the coral animal, its microbial community, and the coral reef ecosystem, by shedding light on the links between genomes, transcriptomes, metabolomes, organisms and ecosystem function. This Collection highlights research published across the Springer Nature portfolio from this ambitious project.