Azure DevOps supports the concept of “Deployment Groups” to facilitate the deployment of applications to multiple target machines or environments. Deployment Groups are particularly useful when deploying applications that need to be installed on different machines, such as web servers, application servers, or virtual machines.

Here’s a brief overview of Deployment Groups in Azure DevOps:

1. Definition: A Deployment Group is a logical grouping of target machines where you want to deploy your application. These machines can be physical servers, virtual machines, or cloud instances.

2. Purpose: Deployment Groups simplify the deployment process by allowing you to define and manage multiple target environments in a single place.

3. Agents: Deployment Groups use Azure Pipelines agents to communicate with the target machines. These agents are installed on each machine in the deployment group and are responsible for executing the deployment tasks.

4. Deployment Jobs: You define deployment jobs in your Azure Pipelines YAML or classic release pipeline that target the deployment group. The jobs specify the tasks to be executed on the target machines in the deployment group.

5. Parallel and Rolling Deployment: Azure DevOps supports parallel and rolling deployments to the target machines in a deployment group. Parallel deployment targets all machines simultaneously, while rolling deployment progresses through the machines one after the other.

6. Security: Access to the deployment group and deployment tasks can be controlled using role-based access control (RBAC) to ensure only authorized users can deploy to specific environments.

7. Scalability: Deployment Groups can scale to support large environments with many target machines, making them suitable for complex application deployments.

To create a Deployment Group in Azure DevOps, you typically perform the following steps:

1. Navigate to your Azure DevOps project and select the desired project.
2. Under the “Project Settings,” locate the “Agent Pools” section and click on “Add Deployment Group” to create a new Deployment Group.
3. Provide a name and optional description for the Deployment Group.
4. Install the Azure Pipelines agent on each target machine and configure it to register with the newly created Deployment Group.
5. In your pipeline or release definition, configure the deployment job(s) to target the Deployment Group.

Keep in mind that Azure DevOps is continually evolving, and there might have been updates or changes to Deployment Groups or Azure Pipelines since my last update. It’s always a good idea to refer to the official Azure DevOps documentation or the Azure portal for the most up-to-date information and features.