How is automatic interface updating performed when data related to LiveData changes?

LiveData is an observable data container in Android that automatically notifies subscribers of changes. The automatic UI update occurs because UI components (such as Activity or Fragment) subscribe to LiveData via the observe() method. When the data inside LiveData changes, a callback method is invoked, allowing the UI to be updated.

Example:

val liveData = MutableLiveData<String>()
liveData.observe(this, Observer { newValue ->
    textView.text = newValue // update the interface when data changes
})

// somewhere in the code
liveData.value = "New value"

Thus, LiveData provides reactive UI updates without the need to manually check for data changes.