What is DI?

In simple terms, DI represents the concept of providing the instances of the dependencies that a class needs, instead of having it construct them itself. But, what are dependencies?

Dependencies are other classes that a certain class depends on. For example, an ExampleViewModel class could contain a repository variable of type Repository:

class ExampleViewModel {
    private val repository: Repository = Repository()
    fun doSomething() {
        repository.use()
    }
}

That's why ExampleViewModel depends on Repository, or Repository is a dependency for ExampleViewModel. Most of the time, classes have many more dependencies, but we'll stick with only one for the sake of simplicity. In this case, the ExampleViewModel provides its own dependencies so it's very easy to create an instance of it:

fun main() {
    val vm = ExampleViewModel...