Merge pull request #253041 from greg-lindsay/appgw-freshness

public PR 114559

Author: prmerger-automator[bot]

articles/application-gateway/overview.md

@@ -6,14 +6,14 @@ author: greg-lindsay
 ms.service: application-gateway
 ms.topic: overview
 ms.custom: mvc
-ms.date: 11/15/2022
+ms.date: 09/27/2023
 ms.author: greglin
 #Customer intent: As an IT administrator, I want to learn about Azure Application Gateways and what I can use them for.
 ---
 
 # What is Azure Application Gateway?
 
-Azure Application Gateway is a web traffic load balancer that enables you to manage traffic to your web applications. Traditional load balancers operate at the transport layer (OSI layer 4 - TCP and UDP) and route traffic based on source IP address and port, to a destination IP address and port.
+Azure Application Gateway is a web traffic (OSI layer 7) load balancer that enables you to manage traffic to your web applications. Traditional load balancers operate at the transport layer (OSI layer 4 - TCP and UDP) and route traffic based on source IP address and port, to a destination IP address and port.
 
 Application Gateway can make routing decisions based on additional attributes of an HTTP request, for example URI path or host headers. For example, you can route traffic based on the incoming URL. So if `/images` is in the incoming URL, you can route traffic to a specific set of servers (known as a pool) configured for images. If `/video` is in the URL, that traffic is routed to another pool that's optimized for videos.