A package is a group of similar types of classes, interfaces, and sub-packages. The packages and plugins help us to build the app without having to develop everything from packages. In Flutter, it allows you to import new widgets or functionality into the app. The packages and plugins have a very small distinction. Generally, packages are the new components or the code written in dart languages, whereas plugins allow more functionality on the device by using the native code. In the DartPub, packages and plugins are both referred to as packages.