Explanation

Box 1: Content Delivery Network
A 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.
Azure Content Delivery Network (CDN) offers developers a global solution for rapidly delivering
high-bandwidth content to users by caching their content at strategically placed physical nodes across the
world. Azure CDN can also accelerate dynamic content, which cannot be cached, by leveraging various
network optimizations using CDN POPs. For example, route optimization to bypass Border Gateway Protocol
(BGP).
Box 2: Azure Redis Cache
Azure Cache for Redis is based on the popular software Redis. It is typically used as a cache to improve the
performance and scalability of systems that rely heavily on backend data-stores. Performance is improved by
temporarily copying frequently accessed data to fast storage located close to the application. With Azure
Cache for Redis, this fast storage is located in-memory with Azure Cache for Redis instead of being loaded
from disk by a database.
References:
https://docs.microsoft.com/en-us/azure/azure-cache-for-redis/cache-overview