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 ## 🛠️ System Design Building Blocks
 - [Vertical vs Horizontal Scaling](https://blog.algomaster.io/p/system-design-vertical-vs-horizontal-scaling)
 - [Databases](https://blog.algomaster.io/p/15-types-of-databases)
-- [Content Delivery Network (CDN)](https://www.cloudflare.com/learning/cdn/what-is-a-cdn/)
+- [Content Delivery Network (CDN)](https://blog.algomaster.io/p/27c62e07-f25b-40ac-a397-101cc54f1f0a)
 - [Domain Name System (DNS)](https://www.cloudflare.com/learning/dns/what-is-dns/)
 - [Caching](https://medium.com/must-know-computer-science/system-design-caching-acbd1b02ca01)
 - [Distributed Caching](https://redis.com/glossary/distributed-caching/)