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I know that the MutableLiveData extends LiveData,
but what is the difference between them (in usage). What are appropriate use cases, means when to use the correct one from the two?
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The only key difference between LiveData and MutableLiveData is that you can change the value of MutableLiveData but LiveData does not allow you to change it's value.
By using LiveData we can only observe the data and cannot set the data. MutableLiveData is mutable and is a subclass of LiveData. In MutableLiveData we can observe and set the values using postValue() and setValue() methods (the former being thread-safe) so that we can dispatch values to any live or active observers.
MutableLiveData is LiveData which is mutable & thread-safe. It's not really that LiveData is immutable, just that it can't be modified outside of the ViewModel class. The ViewModel class can modify it however it wants (e.g. a timer ViewModel).
StateFlow and LiveData have similarities. Both are observable data holder classes, and both follow a similar pattern when used in your app architecture. The StateFlow and LiveData do behave differently: StateFlow requires an initial state to be passed into the constructor, while LiveData does not.
LiveData is immutable while MutableLiveData is mutable. MutableLiveData extends LiveData and provides methods like setValue() and postValue().
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