Apache Lucene is a high-performance, full-featured text search engine library written entirely in Java. It is a technology suitable for nearly any application that requires full-text search, especially cross-platform. Implemented in Java Provides indexing and searching libraries Ranked searching -- best results returned first Many powerful query types: phrase queries, wildcard queries, proximity queries, range queries and more Fielded searching (e.g., title, author, contents) Date-range searching Sorting by any field