Elasticsearch is a search engine based on the Lucene library. It provides a distributed, RESTful search and analytics engine capable of solving a growing number of use cases. Elasticsearch is commonly used for real-time log analytics, full-text search, application monitoring, and business analytics. It supports structured, unstructured, and geospatial data, and offers advanced search features such as relevance scoring, faceted navigation, and aggregation. Elasticsearch's distributed architecture allows it to scale horizontally by adding more nodes to the cluster, providing high availability and fault tolerance. It integrates with various data sources and visualization tools, making it easy to ingest, analyze, and visualize large volumes of data. Elasticsearch is used by thousands of organizations worldwide, including Fortune 500 companies, government agencies, and non-profit organizations, to gain insights from their data and improve decision-making.