> For the complete documentation index, see [llms.txt](https://docs.greennode.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.greennode.ai/vdb/opensearch-cluster-database-ods/opensearch-cluster-database-la-gi.md).

# What is OpenSearch Cluster Database?

## **What is OpenSearch Cluster Database?**

**OpenSearch Database** is a data search and analytics platform developed from Elasticsearch. This platform allows storing, searching and analyzing data in real-time, suitable for applications such as log analytics, system monitoring and text search.

<figure><img src="https://1985221522-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F7rE7M1L7GYcwQzNGd0aB%2Fuploads%2FMKIZNOgnGbkbRStMgjok%2FOpenSearch-Cluster-Database.jpg?alt=media&amp;token=586850e6-d4b1-418e-b049-7602e8ba500b" alt=""><figcaption></figcaption></figure>

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## How does OpenSearch work as a Vector Database?

Currently, vDB supports deploying **OpenSearch** as a **Vector Database**, meaning you can use it for **approximate search (k - Nearest Neighbor - kNN)** on vector embeddings by integrating the kNN plugin on your OpenSearch Cluster. This is a common approach to building vector search systems for **AI/ML, NLP, Recommendation Systems, or Semantic Search**.

<figure><img src="https://1985221522-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F7rE7M1L7GYcwQzNGd0aB%2Fuploads%2FGeH9RHbGXUlsxzq1Gtea%2Fopensearch-vector-db.jpg?alt=media&amp;token=bdda0ed2-a4ba-413d-bf5a-10548cdfb2f8" alt=""><figcaption></figcaption></figure>