Google rolled out its Multitask Unified Model (MUM) on an unspecified date in June 2021 and the busy summer of updates makes it difficult to pinpoint a date. Technically, the passage indexing update rolled out in February is a part of MUM so this could be counted as an extension or the completion of a much larger update or the start of an update that could take months or years to make its full impact.
MUM replaces BERT and Google says the new technology is 1,000x more powerful than its predecessor, allowing the search engine to understand complex queries to a greater degree. MUM also allows Google to multitask more effectively, pulling in content from multiple languages and translating it into the source language of the original query.
Much like BERT, it could take several years for the new technology to mature and have a major impact on the SERPs but Google is already teasing a new search experience, powered by the AI technology for 2022.
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