This is a FOSS1 (free and open-source software) version of Visual Studio Code.
VS Code is made by Microsoft, has proprietary parts, despite them marketing as open-source. It has telemetry enabled by default and allows proprietary extensions. To be clear, that's VS (Visual Studio) Code. VSCodium on the other hand does not include telemetry nor any proprietary code or extensions. It's 100% FOSS under an MIT2 license.