MSMARCO is a machine reading comprehension dataset that contains 1,010,916 anonymous questions from Bing's search query logs, including AI-generated answers and 182,669 human-rewritten answers. The dataset also contains 8,841,823 paragraphs extracted from 3,563,535 documents. The MSMARCO dataset was released by Microsoft in 2016 and updated in 2018. In addition, the dataset has a corresponding ranking competition.