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The linked article is about the BM25 algorithm, which is a popular full-text search algorithm used in search engines. The article explains the basics of the BM25 algorithm, including how it calculates the relevance score of a document to a given query, and how it takes into account factors such as term frequency, document length, and document frequency. The article also discusses the strengths and limitations of the BM25 algorithm, and provides insights into how it can be used in real-world search applications.