Big data may be regarded as so-called non-probability samples. The use of such sources in official statistics requires other approaches than the traditional one based on surveys and censuses.
Big data come in high volume, high velocity and high variety. Their high volume may lead to better accuracy and more details, their high velocity may lead to more frequent and more timely statistical estimates, and their high variety may give opportunities for statistics in new areas.
https://www.cbs.nl/en-gb/background/2020/04/big-data-in-official-statistics
