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RM3 (Relevance Model 3) is a query expansion method in information retrieval based on the relevance model.

The idea of RM3:

• First, a search is performed using the original query.
• Terms that frequently appear in the top relevant documents and are likely relevant are extracted.
• Based on these terms, an expanded query is formed, combining the original terms and the new relevant ones.
• The expanded query is used for a re-search, which improves the quality of the results.

RM3 combines the statistics of the original query and relevant documents, allowing to consider context and synonyms, increasing the completeness and accuracy of the search.

It is used in information retrieval and ranking systems, where it is important to improve the match of results to the user's query.