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redis

redis/redis

An in-memory data store used as a cache, data structure server, document store, vector database, and message broker.

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What is it?

Redis is an in-memory data store that keeps most data in RAM and exposes it through a simple text-based protocol. Beyond plain key-value storage, it offers native strings, hashes, lists, sets, sorted sets, streams, bitmaps, geospatial indexes and several probabilistic structures, along with transactions and Lua scripting.

The project also includes a query engine for indexing hash and JSON documents, with support for vector search, full-text search, geospatial queries and aggregations. Built-in modules add JSON, time series and Bloom, Cuckoo, Count-min, Top-k and t-digest filters. A modules API lets developers add new commands to the server.

The repository contains the server source in C, along with the redis-cli and redis-benchmark tools. It can be built from source on Linux, macOS and BSD systems, or installed via Docker images and package managers.

Key features

  • 01Rich data types including strings, hashes, lists, sets, sorted sets, streams and bitmaps.
  • 02Query engine for vector, full-text and geospatial search over hash and JSON documents.
  • 03Key expiration and multiple eviction policies for cache use.
  • 04Pub/sub messaging, streams with consumer groups, and transactions.
  • 05Lua scripting that runs on the server.
  • 06Modules API for extending server commands.

Use cases

  • Caching frequently accessed data in front of a primary database.
  • Storing user session data for web applications.
  • Building job queues, leaderboards and rate limiters.
  • Serving as a vector store for semantic search and LLM memory or RAG retrieval.

Quick start

  1. 1

    Start a Redis server with Docker

    docker run -d -p 6379:6379 redis:latest
  2. 2

    Or install a binary distribution such as Homebrew, Snap, RPM or Debian from the README links

Things to know

  • The license is not clearly identified in the project metadata.
  • Vector set is marked beta in the README.

Topics

#cache#in-memory-database#key-value-store#nosql#vector-database#message-queue#caching#database#distributed-systems#in-memory

FAQ

What is redis?
An in-memory data store used as a cache, data structure server, document store, vector database, and message broker. Redis is an in-memory data store that keeps most data in RAM and exposes it through a simple text-based protocol. Beyond plain key-value storage, it offers native strings, hashes, lists, sets, sorted sets, streams, bitmaps, geospatial indexes and several probabilistic structures, along with transactions and Lua scripting.
Is redis free to use? What license does it have?
redis is open source under the Other license. Check the license terms before using it in commercial products.
Is redis still maintained?
Actively maintained. The last commit to redis was on Oct 20, 2026.
What can I use redis for?
Caching frequently accessed data in front of a primary database. Storing user session data for web applications. Building job queues, leaderboards and rate limiters. Serving as a vector store for semantic search and LLM memory or RAG retrieval.
How do I install redis?
Start a Redis server with Docker: docker run -d -p 6379:6379 redis:latest Or install a binary distribution such as Homebrew, Snap, RPM or Debian from the README links
Where can I get redis?
The source code and installation instructions are on GitHub: https://github.com/redis/redis

Summary generated by AI from the project's README. GitHub stats refresh daily.

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