/Java/What is datasnapshot.getkey() in android studio

What is datasnapshot.getkey() in android studio

Query reference=FirebaseDatabase.getInstance().getReference().child("products").orderByChild("name").equalTo("iphon");
reference.addListenerForSingleValueEvent(new ValueEventListener() {
    @Override
    public void onDataChange(DataSnapshot dataSnapshot) {
        for (DataSnapshot childSnapshot: dataSnapshot.getChildren()) {
            String key=childSnapshot.getKey();
            Log.i(TAG,key);
        }
    }

Source: stackoverflow.com

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