Solr: Solr is a high performance search server built using Lucene Java, with XML/HTTP and JSON/Python/Ruby APIs, hit highlighting, faceted search, caching, replication, and a web admin interface.
Lucene: Apache Lucene is a high-performance, full-featured text search engine library written entirely in Java and embedded in Solr. It is suitable for nearly any application that requires full-text search. Lucene is designed to be embedded into projects in order to provide full-text search capabilities. Solr has many more features and administration capabilities including searching structured data without requiring custom code, loading data from CSV files, tolerant parsing of user input, faceted searching, highlighting matched text in results, and retrieving search results in a variety of formats (XML, JSON, …).
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