Redis is an in-memory data store used as a cache, session store and message broker, and, with its search and vector features, as a database for real-time applications. Applications read and write data in memory, which keeps response times short. The company behind it, Redis Ltd., is headquartered in San Francisco and offers Redis Enterprise and the Redis Cloud service alongside its open-source software. Redis 8 is available under the AGPLv3 licence, which the Open Source Initiative approves, as well as under source-available licence options.
The privacy policy names Redis Ltd. and its affiliates as data controller. It states that information from cloud-based services is stored in the European Union, the United States and certain Asian locations, including Japan. It does not specify where customer databases are hosted, so European customers should set out the hosting region in their contract. As a US-headquartered company, Redis is subject to US law for data it controls. Running the AGPLv3 version on the organisation's own European infrastructure is an option that limits dependence on the vendor.