wunderbar
wonderful
Extraordinarily good, beautiful, or pleasant; inspiring enthusiasm.
Wir hatten einen wunderbaren Urlaub am Meer.
We had a wonderful vacation by the sea.

wonderful
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wonderful
Extraordinarily good, beautiful, or pleasant; inspiring enthusiasm.
Wir hatten einen wunderbaren Urlaub am Meer.
We had a wonderful vacation by the sea.

The word is made up of 'das Wunder' (the miracle) and the suffix '-bar' (-able). So it describes something that is as beautiful or good as a miracle.
Die Aussicht von diesem Berg ist einfach wunderbar.
The view from this mountain is simply wonderful.
'Wunderbar' (wonderful) can not only describe a noun, but can also be used as an adverb to intensify a verb or another adjective. It then means something like 'very well' or 'excellent'.
Das Essen hat wunderbar geschmeckt.
The food tasted wonderful.
'Wunderbar' (wonderful) is often used to express positive experiences and feelings. Typical combinations are 'ein wunderbarer Tag' (a wonderful day), 'eine wunderbare Idee' (a wonderful idea), 'ein wunderbares Gefühl' (a wonderful feeling), or 'ein wunderbarer Mensch' (a wonderful person).
Das war eine wunderbare Überraschung, vielen Dank!
That was a wonderful surprise, thank you very much!
beautiful / nice
'schön' and 'wunderbar' can both describe something positive. 'schön' is very general: it fits people, places, things, moments, or feelings. It can simply mean that something is beautiful, pretty, or pleasant. 'wunderbar' is stronger and sounds more enthusiastic. You use it when something is especially good, very pleasant, or impressive. In everyday language, 'schön' is more neutral and more common, while 'wunderbar' emphasizes more joy or admiration.

Das Essen bei Maria war wunderbar, alle wollten noch eine Portion.
The food at Maria's was wonderful; everyone wanted another serving.
Nach dem Regen war der Spaziergang im Park besonders schön.
After the rain, the walk in the park was especially nice.