What is BM25 and how important it is for ranking?

The article discussed in the podcast explains the BM25 algorithm, which is used by search engines to determine the relevance of documents for a specific search query. It explains the components of the BM25 formula - term frequency, inverse document frequency and document length normalization - and compares BM25 with the TF-IDF algorithm. https://www.kopp-online-marketing.com/what-is-bm25