Visual Studio Code is a free, cross-platform, open source code editor provided by Microsoft.
Visual Studio Code is a streamlined code editor with support for development operations like debugging, task running and version control. It is provided by Microsoft. More details can be found in the FAQ.
For information on how to install Visual Studio Code in Ubuntu, see this question: How do I install Visual Studio Code? Microsoft also provides a support page on how to use Visual Studio Code in Debian-based Linux distributions (including Ubuntu) here.