Or to make things more succinct:
* VSCode is a extendable code editor (like vim, neovim, Zed and Sublime)
* Jetbrains Rider is a fully equipped Integrated Development Environment (like Microsoft Visual Studio or its direct sibling Jetbrains IntelliJ IDEA)
And while extensions are optional within a IDE (and often solely used for increased productivity), more often than not they are a necessity in a code editor to even become productive.
