What Does Apache Solr Mean?
Apache Solr is an open source enterprise search platform which is part of the Apache Lucene project.
Techopedia Explains Apache Solr
Apache Solr was developed using Java and runs as a standalone, full-text search server which is contained within a servlet like Jetty. As part of the Lucene project, Solr uses the Lucene Java search library as its core for searching and indexing.