What is the name of Microsoft's free, open-source code editor?

Microsoft's free code editor is Visual Studio Code, commonly shortened to VS Code. Microsoft announced it on April 29, 2015, and designed it as a lightweight, cross-platform tool for Windows, macOS, and Linux rather than as the full Visual Studio development suite.

VS Code includes syntax highlighting, debugging, source-control integration, intelligent code completion, search, refactoring tools, and a built-in terminal. Its extension system lets developers add language support, themes, debuggers, linters, and other features. The editor is built with Electron and uses Microsoft's Monaco editor technology, which is also used in some Microsoft web-development tools.

There is a technical nuance behind the phrase “open-source.” The downloadable Microsoft-branded build is distributed under Microsoft's software license, while the related Code-OSS project is released under the MIT License. That distinction can cause confusion, but Visual Studio Code remains the canonical answer to this quiz question. It is also different from Visual Studio, Microsoft's larger integrated development environment for professional application development.