Azure Content Delivery Network (CDN) is the correct choice for storing content close to end users. A CDN is a globally distributed network of servers (Points of Presence or POPs) that caches static content like images, CSS, and JavaScript files. When a user requests this content, it is delivered from the geographically closest POP, which significantly reduces latency and improves load times.

Azure Cache for Redis is the appropriate solution for storing content close to the application. It provides a managed, in-memory data store that applications can use as a high-performance cache. By caching frequently accessed data in Redis, which is located in the same Azure region as the application, the application can reduce its dependency on slower backend datastores (like SQL databases), thereby improving response time and scalability.

Azure Content Delivery Network (CDN) Documentation: "An Azure content delivery network (CDN) is a distributed network of servers that can efficiently deliver web content to users. CDNs store cached content on edge servers in point-of-presence (POP) locations that are close to end users, to minimize latency."

Source: Microsoft Corporation. (2023). What is a content delivery network (CDN) on Azure?. Microsoft Learn. Retrieved from https://learn.microsoft.com/en-us/azure/cdn/cdn-overview, Overview section.

Azure Cache for Redis Documentation: "Azure Cache for Redis provides an in-memory data store based on the Redis software. ... It improves the performance and scalability of an application that uses backend data stores heavily. It's able to process large volumes of application requests by keeping frequently accessed data in the server memory that can be written to and read from quickly."

Source: Microsoft Corporation. (2023). What is Azure Cache for Redis?. Microsoft Learn. Retrieved from https://learn.microsoft.com/en-us/azure/azure-cache-for-redis/cache-overview, Introduction section.