Merge pull request #113913 from DawgFan/patch-2

Update App-Insights Overview

Author: PRMerger9

articles/azure-monitor/app/app-insights-overview.md

@@ -8,12 +8,12 @@ ms.custom: mvc
 ---
 
 # What is Application Insights?
-Application Insights, a feature of [Azure Monitor](../overview.md), is an extensible Application Performance Management (APM) service for developers and DevOps professionals. Use it to monitor your live applications. It will automatically detect performance anomalies, and includes powerful analytics tools to help you diagnose issues and to understand what users actually do with your app.  It's designed to help you continuously improve  performance and usability. It works for apps on a wide variety of platforms including .NET, Node.js and Java EE, hosted on-premises, hybrid, or any public cloud. It integrates with your DevOps process, and has connection points to a variety of development tools. It can monitor and analyze telemetry from mobile apps by integrating with Visual Studio App Center.
+Application Insights, a feature of [Azure Monitor](../overview.md), is an extensible Application Performance Management (APM) service for developers and DevOps professionals. Use it to monitor your live applications. It will automatically detect performance anomalies, and includes powerful analytics tools to help you diagnose issues and to understand what users actually do with your app.  It's designed to help you continuously improve  performance and usability. It works for apps on a wide variety of platforms including .NET, Node.js, Java, and Python hosted on-premises, hybrid, or any public cloud. It integrates with your DevOps process, and has connection points to a variety of development tools. It can monitor and analyze telemetry from mobile apps by integrating with Visual Studio App Center.
 
 ## How does Application Insights work?
-You install a small instrumentation package in your application, and set up an Application Insights resource in the Microsoft Azure portal. The instrumentation monitors your app and sends telemetry data to Azure Monitor. (The application can run anywhere - it doesn't have to be hosted in Azure.)
+You install a small instrumentation package (SDK) in your application or enable Application Insights codelessly when [supported](../../azure-monitor/app/platforms.md). The instrumentation monitors your app and directs the telemetry data to an Azure Application Insights Resource using a unique GUID that we refer to as an Instrumentation Key.
 
-You can instrument not only the web service application, but also any background components, and the JavaScript in the web pages themselves. 
+You can instrument not only the web service application, but also any background components, and the JavaScript in the web pages themselves. The application and its components can run anywhere - it doesn't have to be hosted in Azure.
 
 ![Application Insights instrumentation in your app sends telemetry to your Application Insights resource.](./media/app-insights-overview/diagram.png)