For Hungary the records list Types C and F at 230 V and 50 Hz. No surprises on voltage: Hungary runs at 230 V, the same range as at home in the UK.
Handy for multi-stop trips: Estonia, Moldova, Germany and Montenegro use the same plug types. Nearby but different: Cyprus, Malta and Gibraltar – an adapter for Hungary will not fit there. Across Europe this setup is common: 31 of 50 countries.
Protective earth
Grounded and ungrounded sockets may occur
Earthed sockets (Type F) and unearthed ones (Type C) exist side by side. For metal-bodied appliances the protective-earth path is what matters.