freshness review

Author: duongau

articles/cdn/cdn-overview.md

@@ -2,35 +2,32 @@
 title: What is a content delivery network (CDN)? - Azure | Microsoft Docs
 description: Learn what Azure Content Delivery Network (CDN) is and how to use it to deliver high-bandwidth content.
 services: cdn
-documentationcenter: ''
 author: duongau
-manager: danielgi
-editor: ''
-
+manager: kumud
 ms.assetid: 866e0c30-1f33-43a5-91f0-d22f033b16c6
 ms.service: azure-cdn
-ms.workload: tbd
-ms.tgt_pltfrm: na
 ms.topic: overview
-ms.date: 05/09/2018
+ms.date: 02/21/2023
 ms.author: duau
 ms.custom: mvc
 
 ---
 # What is a content delivery network on Azure?
-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).
+A content delivery network (CDN) is a distributed network of servers that can efficiently deliver web content to users. A CDN store cached content on edge servers in point-of-presence (POP) locations that are close to end users, to minimize latency. 
+
+Azure 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 can't get cached, by using various network optimizations using CDN POPs. For example, route optimization to bypass Border Gateway Protocol (BGP).
 
 The benefits of using Azure CDN to deliver web site assets include:
 
-* Better performance and improved user experience for end users, especially when using applications in which multiple round-trips are required to load content.
+* Better performance and improved user experience for end users, especially when using applications where multiple round-trips requests required by end users to load contents.
 * Large scaling to better handle instantaneous high loads, such as the start of a product launch event.
-* Distribution of user requests and serving of content directly from edge servers so that less traffic is sent to the origin server.
+* Distribution of user requests and serving of content directly from edge servers so that less traffic gets sent to the origin server.
 
 For a list of current CDN node locations, see [Azure CDN POP locations](cdn-pop-locations.md).
 
 ## How it works
+
 ![CDN Overview](./media/cdn-overview/cdn-overview.png)
 
 1. A user (Alice) requests a file (also called an asset) by using a URL with a special domain name, such as _<endpoint name>_.azureedge.net. This name can be an endpoint hostname or a custom domain. The DNS routes the request to the best performing POP location, which is usually the POP that is geographically closest to the user.
@@ -41,20 +38,21 @@ For a list of current CDN node locations, see [Azure CDN POP locations](cdn-pop-
 
 4. An edge server in the POP caches the file and returns the file to the original requestor (Alice). The file remains cached on the edge server in the POP until the time-to-live (TTL) specified by its HTTP headers expires. If the origin server didn't specify a TTL, the default TTL is seven days.
 
-5. Additional users can then request the same file by using the same URL that Alice used, and can also be directed to the same POP.
+5. More users can then request the same file by using the same URL that Alice used, and gets directed to the same POP.
 
 6. If the TTL for the file hasn't expired, the POP edge server returns the file directly from the cache. This process results in a faster, more responsive user experience.
 
 ## Requirements
 * To use Azure CDN, you must own at least one Azure subscription. 
 * You also need to create a CDN profile, which is a collection of CDN endpoints. Every CDN endpoint is a specific configuration which users can customize with required content delivery behavior and access. To organize your CDN endpoints by internet domain, web application, or some other criteria, you can use multiple profiles. 
-* Since [Azure CDN pricing](https://azure.microsoft.com/pricing/details/cdn/) is applied at the CDN profile level, you must create multiple CDN profiles if you want to use a mix of pricing tiers. For information about the Azure CDN billing structure, see [Understanding Azure CDN billing](cdn-billing.md).
+* Since [Azure CDN pricing](https://azure.microsoft.com/pricing/details/cdn/) gets applied at the CDN profile level, so if you want to use a mix of pricing tiers you must create multiple CDN profiles. For information about the Azure CDN billing structure, see [Understanding Azure CDN billing](cdn-billing.md).
 
 ### Limitations
+
 Each Azure subscription has default limits for the following resources:
- - The number of CDN profiles that can be created.
- - The number of endpoints that can be created in a CDN profile. 
- - The number of custom domains that can be mapped to an endpoint.
+ - The number of CDN profiles created.
+ - The number of endpoints created in a CDN profile. 
+ - The number of custom domains mapped to an endpoint.
 
 For more information about CDN subscription limits, see [CDN limits](../azure-resource-manager/management/azure-subscription-service-limits.md).