BERT means bidirectional encoder representations from transformers. The algorithm was made available to the scientific community as open source code in 2018. On 25 October 2019, Pandu Nayak (Vice President of the Google search engine) explained that BERT is used on Google.
The aim of the BERT update is to improve the understanding of queries in order to provide more relevant results, especially for queries formulated in a natural way. BERT can also help Google to better understand the content of its index.