The majority of European countries including Spain, France, Italy, Germany and Portugal have outlet sockets that require a two-pin plug known as 'Type C'.
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For Spain there are two associated plug types, types C and F. Plug type C is the plug which has two round pins and plug type F is the plug which has two round pins with two earth clips on the side. Spain operates on a 230V supply voltage and 50Hz.
European Voltage is usually 220, and the US is 110. So things without a transformer need a converter. You DO need an adapter to plug things in (unless the hotel has some universal plugs, which the Park Hyatt does, I believe have). DO NOT EXPECT YOUR HAIRDRYER, CURLING IRONS or other devices to work in Europe.
To know whether your appliance or smart device will work in Europe with just an adapter, look for a sticker or a printed area on the item or its AC adapter that states something like “Voltage: 110.” In the case of dual voltage devices, the phrase “110–220V” will be printed somewhere on the item or its plug.
The plug shapes and power voltage is different between America and European countries. America uses type-A/B plugs, while most European countries use Type-C plugs (Type-C also fits into Type E, F, H, J, K, L, N sockets that replace the Type C socket in some countries like Italy, Denmark, Switzerland etc.).
The Type C plug (also called the Europlug) has two round pins. The pins are 4 to 4.8 mm wide with centers that are spaced 19 mm apart; the plug fits any socket that conforms to these dimensions.