I was going through the Android samples for Navigation Architecture. Can anyone tell me whats are the below dependencies for or where can I read about the differences?

navigation.runtime = "androidx.navigation:navigation-runtime:$versions.navigation"
navigation.runtime_ktx = "androidx.navigation:navigation-runtime-ktx:$versions.navigation"
navigation.fragment = "androidx.navigation:navigation-fragment:$versions.navigation"
navigation.fragment_ktx = "androidx.navigation:navigation-fragment-ktx:$versions.navigation"
navigation.ui = "androidx.navigation:navigation-ui:$versions.navigation"
navigation.ui_ktx = "androidx.navigation:navigation-ui-ktx:$versions.navigation"

here https://developer.android.com/guide/navigation/navigation-getting-started