# Overview * EigenDB is a light-weight in-memory vector database written in Go. It's also open-source! ❤️ * It features the ability to perform similarity search, which utilizes the Hierarchical Navigable Small Worlds (HNSW) algorithm ([more](/eigen-db-docs/whats-a-vector-database/similarity-search-in-eigendb.md)). * Basic database operations can easily be performed through its very simple [REST API](/eigen-db-docs/rest-api.md). If you know nothing about vector databases, read [this](/eigen-db-docs/whats-a-vector-database.md). --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://eigen-db.gitbook.io/eigen-db-docs/overview.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.