The RankBrain Algorithm is part of Google's search algorithms, using machine learning to understand the context of search queries and improve the relevance of search results. It helps Google process and interpret the vast amount of searches it receives daily, especially for ambiguous or unique queries. RankBrain is designed to better understand the nuances of language and searcher intent, contributing to more accurate and relevant search results by effectively translating the semantics of queries into understandable concepts for the search engine.