Azure DevOps Server 2019, previously known as Team Foundation Server (TFS) 2019, is a Microsoft product that provides a set of collaboration tools, source code management (version control), build automation, release management, and other software development and DevOps-related functionalities. It is designed to help teams plan, develop, test, and deliver software efficiently.

Here are some key features and components of Azure DevOps Server 2019:

1. Version Control: Azure DevOps Server supports both Git and Team Foundation Version Control (TFVC). Developers can manage their source code using these version control systems.

2. Work Item Tracking: This feature allows teams to track and manage tasks, bugs, user stories, and other work items throughout the software development lifecycle.

3. Build Automation: Teams can set up build pipelines to automate the process of compiling, testing, and packaging their applications. Azure DevOps Server supports various build agents and build steps.

4. Release Management: Release pipelines enable teams to automate the deployment of applications to various environments, such as development, testing, and production.

5. Integration: Azure DevOps Server integrates with various development tools, including Visual Studio, Visual Studio Code, and other popular IDEs. It also offers REST APIs for custom integrations.

6. Reporting: Teams can generate reports and track various metrics related to code quality, work item progress, and build/release performance.

7. Test Management: Test plans and test suites can be created to manage and execute manual and automated tests.

8. Extensions: Azure DevOps Server supports extensions from the Visual Studio Marketplace, allowing teams to customize and enhance their DevOps processes.

9. Dashboards: Customizable dashboards provide insights into project status, code quality, and work item progress.

10. Authentication and Security: Azure DevOps Server supports various authentication methods and provides security features to control access to projects and repositories.

11. Licensing: Azure DevOps Server requires licenses for users who access the system, with different types of licenses offering varying levels of access and capabilities.