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What is Redis, What Does It Do?

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If you’re considering a server-side caching solution, you may have heard about Redis .

In this article , we will make a detailed review about Redis . We will cover the following topics.

  • What is Caching?
  • What is Redir?
  • What Is Redis Used For?
  • How Does Redis Store Data?

What is Caching ?

Caching is the process of storing some data in Cache.

A cache is a temporary storage component area where data is stored so that data can be served faster in the future.

What is Redis?

Redis is written in the C programming language.
Redis is an open source (BSD licensed), in-memory data structure repository used as a database, cache, and message broker.
Strings, Squares, Lists, Sets etc. It supports various data structures such as

Redis’ name comes from ” RE mote DI ctionary Server “.

Giants like GitHub and Instagram were some of the first companies to adopt Redis .

What Is Redis Used For?

Redis is used to create benefits in the following topics.

Smart Caching

Redis is commonly used as a cache to store frequently accessed data in memory so that applications can respond to users.

With the capacity to determine how long you want to keep data and what data to extract first, Redis provides a number of intelligent caching models.

Session Storage

Redis can be used as a good and popular alternative for storing sessions.

With Redis , user profiles, credentials, user-specific data, etc. It allows you to read session data such as milliseconds at speeds.

Data Expiration and Release Policies

Data structures in Redis can be marked with a Time To Live (TTL) in seconds and then removed.

A number of configurable smart “evacuation policies” are available.


Pub / Sub messaging allows messages to be transmitted to channels and all subscribers to that channel receive this message.

This feature allows information to flow quickly through your infrastructure without using space in your database as messages are not stored. So you can notify services of the load on other infrastructure or applications, or update game scores and skip notifications.


Redis supports putting jobs that take time to happen into a queue structure and then processing them later.

How Does Redis Store Data?

Redis has five data types:

  • String : a text value
  • Hash : A hash table of string keys and values
  • List : List of string values
  • Set : List of non-repeating string values
  • Sorted Set : A non-repeating list of string values ​​sorted by a point value

As a result

Redis is a very useful data service for interconnecting microservices. For workloads that focus on rapidly changing temporary datasets, Redis is a strong choice.

Redis is less suitable for workloads where data needs to be protected (i.e. sensitive or difficult to recreate) and the workload may be better served by another data service (eg PostgreSQL, MongoDB, or Elasticsearch).

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