Azure Redis Cache is a distributed, managed, in-memory cache service provided by Microsoft Azure. Redis is an open-source, in-memory data structure store that is commonly used as a database, cache, and message broker. Azure Redis Cache provides a fully managed and highly scalable implementation of Redis in Azure, with the ability to create and manage Redis caches in Azure using the Azure portal, Azure CLI, Azure PowerShell, or the Azure SDKs.

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Azure Redis Cache supports the use of multiple Redis databases, which can be used to store data in a hierarchical structure. Each Redis cache instance can be configured with various parameters, such as the cache size, the maximum number of clients, and the eviction policy, among others.

Applications can use Azure Redis Cache to cache frequently accessed data, which can help to reduce latency and improve application performance. Azure Redis Cache supports the use of various data types, including strings, hashes, lists, sets, and sorted sets, and provides various APIs and libraries for interacting with Redis caches.

In addition, Azure Redis Cache integrates with various Azure services, such as Azure Web Apps, Azure Functions, and Azure Search, among others, providing a highly scalable and performant caching solution for Azure-based applications.