This document provides an introduction to using Apache Solr for enterprise search on a website. It discusses the configuration options for Solr, including solrconfig.xml and schema.xml. It also summarizes the Apache Solr module that comes with Drupal, which provides search indexing, filters, and hooks out of the box. Additional Solr modules are mentioned, including Views and Attachments integrations, as well as a multiserver module. The document aims to give an overview of Solr and how it can be implemented with Drupal.