From the site... Whether you’re working on a long-term project, a short-lived feature branch, or want to quickly review a pull request, Visual Studio Online

From the site... Whether you’re working on a long-term project, a short-lived feature branch, or want to quickly review a pull request, Visual Studio Online can help you be more productive by providing a fully configured development environment in minutes. By pointing to a Git repo, Visual Studio Online sets up everything you need to focus on being productive: * Source code * Runtimes * Linters & debuggers * Extensions