One of the great features that made Unity popular is its ability to provide builds for multiple platforms out of the box. But there may be scenarios in which you would like Unity to comprise just a part of your application, while the rest is written with some other framework. A typical use case is using Unity’s functionality inside a Flutter application.

CLI stands for command-line interface, a text-based interface you can use to input commands and perform various operations. If you’ve ever used the dart or flutter commands in your console, you’ve used a CLI. Sometimes, though, you may end up writing a CLI of your own.