If you have looked into Magento hosting requirements, you will have seen Redis mentioned repeatedly. Redis is an in-memory data store that Magento uses to make the store faster and more scalable. In a production Magento environment, it is considered essential rather than optional.

Understanding what Redis does helps explain why proper Magento hosting is configured so differently from ordinary web hosting.

What Is Redis?

Redis keeps data in memory rather than on disk, which makes reading and writing that data extremely fast. Magento uses it as a high-speed layer that sits between the application and the much slower database.

What Magento Uses Redis For

In a typical Magento setup, Redis handles two important jobs:

• Caching — Magento stores frequently used data, such as configuration and computed results, in Redis so it does not have to be rebuilt from the database on every request.
• Session storage — customer sessions, including shopping carts and login state, can be stored in Redis so they are fast to read and consistent across the environment.

By serving this data from memory, Redis dramatically reduces the load on the database and speeds up page rendering.

What Happens Without It?

Magento can technically fall back to storing cache and sessions on the filesystem or in the database, but performance suffers quickly. The database has to do far more work, pages take longer to build, and the store struggles under concurrent traffic.

This is one of the reasons Magento performs poorly on basic shared hosting, where Redis is often unavailable — a point we explore in Magento hosting versus shared hosting.

Redis and Scalability

Caching is not only about single-page speed; it is about handling many visitors at once. During a busy sale, the difference between serving cached data from memory and rebuilding it from the database repeatedly can be the difference between a fast store and one that grinds to a halt.

Do You Have to Manage Redis Yourself?

Setting up and tuning Redis correctly — separating cache and session storage, sizing memory and keeping it healthy — takes expertise. On managed hosting, this is handled as part of the platform.

MyShopCarts provisions and manages the services Magento needs, including in-memory caching, as standard in every store's isolated environment. Magento's other key service, search, is covered in why Magento needs OpenSearch.

Learn more about managed Magento hosting and choose a plan that fits your store.