Update Azure README.md, What is N-tier achitecture (#10201)

bregman-arie · Feb 2, 2024 · 4b3d7d0 · 4b3d7d0
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@@ -152,6 +152,8 @@ An Azure region is a set of datacenters deployed within an interval-defined and
 
 <details>
 <summary>What is the N-tier architecture?</summary><br><b>
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+N-tier architecture divides an application into logical layers and physical tiers. Each layer has a specific responsibility. Tiers are physically separated, running on separate machines. An N-tier application can have a closed layer architecture or an open layer architecture. N-tier architectures are typically implemented as infrastructure-as-service (IaaS) applications, with each tier running on a separate set of VMs
 </b></details>
 
 ### Storage