What does the SwiftUI `@State` keyword do?

Question

The SwiftUI tutorial uses the @State keyword to indicate mutable UI state:

@State var showFavoritesOnly = false

It offers this summ

Answer 1

If you know about C# and windows development. @State is similar if not the same as x:Bind or Binding.. On a collection it is similar if not the same as ObservableCollection.

As fredpi said, SwiftUI is listing for updates on vars with the @State property delegate.