Merge pull request #157233 from robinsh/robinsh-0503

Try to improve iot hub beginner article

Author: GitHubber17

articles/iot-hub/about-iot-hub.md

@@ -1,54 +1,54 @@
 ---
-title: Introduction to Azure IoT Hub | Microsoft Docs
-description: Learn about Azure IoT Hub. This IoT service is built for scalable data ingestion, device management, and security.
-author: nberdy
-ms.author: nberdy
-ms.date: 08/08/2019
+title: What is Azure IoT Hub | Microsoft Docs
+description: This article explains the uses for an Azure IoT Hub. It allows you to read data in a scalable manner, and enables you to manage devices securely.
+author: robinsh
+ms.author: robinsh
+ms.date: 05/03/2021
 ms.topic: overview
 ms.custom:  [mvc, amqp, mqtt, 'role: Direction', 'role: System Architecture']
 ms.service: iot-hub
 services: iot-hub
 ---
 
-# What is Azure IoT Hub?
+# What is Azure IoT Hub
 
-IoT Hub is a managed service, hosted in the cloud, that acts as a central message hub for bi-directional communication between your IoT application and the devices it manages. You can use Azure IoT Hub to build IoT solutions with reliable and secure communications between millions of IoT devices and a cloud-hosted solution backend. You can connect virtually any device to IoT Hub.
+IoT Hub is a managed service hosted in the cloud that acts as a central message hub for communications in both directions between an IoT application and its attached devices. You can connect millions of devices and their backend solutions reliably and securely. Almost any device can be connected to an IoT Hub. 
 
-IoT Hub supports communications both from the device to the cloud and from the cloud to the device. IoT Hub supports multiple messaging patterns such as device-to-cloud telemetry, file upload from devices, and request-reply methods to control your devices from the cloud. IoT Hub monitoring helps you maintain the health of your solution by tracking events such as device creation, device failures, and device connections.
+Several messaging patterns are supported, including device-to-cloud telemetry, uploading files from devices, and request-reply methods to control your devices from the cloud. IoT Hub also supports monitoring to help you track creating devices, connecting devices, and device failures.
 
-IoT Hub's capabilities help you build scalable, full-featured IoT solutions such as managing industrial equipment used in manufacturing, tracking valuable assets in healthcare, and monitoring office building usage.
+With IoT Hub's capabilities, you can build scalable, full-featured IoT solutions such as managing industrial equipment used in manufacturing, tracking valuable assets in healthcare, and monitoring office building usage.
 
 ## Scale your solution
 
-IoT Hub scales to millions of simultaneously connected devices and millions of events per second to support your IoT workloads. For more information about scaling your IoT Hub, see [IoT Hub Scaling](iot-hub-scaling.md). To learn more about the multiple  tiers of service offered by IoT Hub and how to best fit your scalability needs, check out the [pricing page](https://azure.microsoft.com/pricing/details/iot-hub/).
+IoT Hub scales to millions of simultaneously connected devices and millions of events per second to support your IoT workloads. For more information about scaling your IoT Hub, see [IoT Hub Scaling](iot-hub-scaling.md). To learn more about the multiple tiers of service offered by IoT Hub and how to best fit your scalability needs, check out the [pricing page](https://azure.microsoft.com/pricing/details/iot-hub/).
 
 ## Secure your communications
 
-IoT Hub gives you a secure communication channel for your devices to send data.
+You can send data securely using IoT Hub.
 
 * Per-device authentication enables each device to connect securely to IoT Hub and for each device to be managed securely.
 
 * You have complete control over device access and can control connections at the per-device level.
 
 * The [IoT Hub Device Provisioning Service](../iot-dps/index.yml) automatically provisions devices to the right IoT hub when the device first boots up.
 
-* Multiple authentication types support a variety of device capabilities:
+* Multiple authentication types enable support of a variety of device capabilities:
 
-  * SAS token-based authentication to quickly get started with your IoT solution.
+  * SAS token-based authentication allows you to quickly get started with your IoT solution.
 
-  * Individual X.509 certificate authentication for secure, standards-based authentication.
+  * Individual X.509 certificate authentication is available for secure, standards-based authentication.
 
-  * X.509 CA authentication for simple, standards-based enrollment.
+  * X.509 CA authentication can be used for simple, standards-based enrollment.
 
 ## Route device data
 
 Built-in message routing functionality gives you flexibility to set up automatic rules-based message fan-out:
 
-* Use [message routing](iot-hub-devguide-messages-d2c.md) to control where your hub sends device telemetry.
+* [Message routing](iot-hub-devguide-messages-d2c.md) is used to control where your hub sends device telemetry.
 
 * There is no additional cost to route messages to multiple endpoints.
 
-* No-code routing rules take the place of custom message dispatcher code.
+* Routing rules can be configured to automatically direct messages based on content in those messages without having to write any code.
 
 ## Integrate with other services
 
@@ -74,7 +74,7 @@ You can manage your devices connected to IoT Hub with an array of built-in funct
 
 ## Make your solution highly available
 
-There's a 99.9% [Service Level Agreement for IoT Hub](https://azure.microsoft.com/support/legal/sla/iot-hub/). The full [Azure SLA](https://azure.microsoft.com/support/legal/sla/) explains the guaranteed availability of Azure as a whole.
+IoT Hub has a 99.9% [Service Level Agreement for IoT Hub](https://azure.microsoft.com/support/legal/sla/iot-hub/). The full [Azure SLA](https://azure.microsoft.com/support/legal/sla/) explains the guaranteed availability of Azure as a whole.
 
 ## Connect your devices
 
@@ -107,7 +107,7 @@ If your solution cannot use one of the supported protocols, you can extend IoT H
 
 ## Quotas and limits
 
-Each Azure subscription has default quota limits in place to prevent service abuse, and these limits could impact the scope of your IoT solution. The current limit on a per-subscription basis is 50 IoT hubs per subscription. You can request quota increases by contacting support. For more information, see [IoT Hub Quotas and Throttling](iot-hub-devguide-quotas-throttling.md). For more details on quota limits, see one of the following articles:
+Each Azure subscription has default quota limits in place to prevent service abuse. These limits could impact the scope of your IoT solution. The current limit on a per-subscription basis is 50 IoT hubs per subscription. You can request quota increases by contacting support. For more information, see [IoT Hub Quotas and Throttling](iot-hub-devguide-quotas-throttling.md). For more details on quota limits, see one of the following articles:
 
 * [Azure subscription service limits](../azure-resource-manager/management/azure-subscription-service-limits.md)