ApacheSolr is an indexing server from apache. It is written in Java and can be used to make search pages on your website. Most Websites use a MySQL database to store its data and standard MySQL search using SQL or FULLTEXT Searching by MySQL. But with ApacheSolr we can not only search but also improve the search results. Solr recognizes plurals and similar words like read, reading or A-DATA, adata etc. Therefore Solr returns more efficient search results.