# Azure Cache for Redis

> Chapter 94 of the Courseiva AZ-900 curriculum — https://courseiva.com/learn/az-900/azure-cache-redis

**Official objective:** 2.4 — Azure Architecture Services

## Introduction

This chapter covers Azure Cache for Redis. AZ-900 tests under 2.4.

## A Speed Cache

Retrieving data from a database is slow. A cache keeps frequently-used data in fast memory, reducing database load and improving response time.

## Core explanation

Redis is an in-memory data store used as a cache. Azure Cache for Redis is a managed Redis service, improving application performance by caching frequently-accessed data.

## Real-world context

A web app caches user sessions in Redis, reducing database queries and improving response time.

## Exam focus

Objective 2.4 expects understanding of caching for performance.

## Step by step

1. **Create a Redis cache** — A managed Redis instance is provisioned.
2. **Store frequently-accessed data** — Hot data is cached in Redis.
3. **Check cache first** — Applications check the cache before the database.

## Key takeaways

- Redis is an in-memory cache.
- Improves performance by reducing database load.
- Suitable for frequently-accessed data.

## FAQ

**What is Azure Cache for Redis?**

It's a managed in-memory cache service using Redis, improving application performance by caching frequently-accessed data.

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Interactive version with quiz and diagrams: https://courseiva.com/learn/az-900/azure-cache-redis