> 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="/files/d3JpfDgENwf0wWBDflo2" 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="/files/bI5MQk6B6xOnXCpKflkl" alt=""><figcaption></figcaption></figure>