This is the 3035th most frequent Polish word.
piękne
"Piękne" means "beautiful" in English.
In this sentence, 'piękne' is used as an adjective describing 'widok' (view), agreeing in case, gender (neuter), and number.
To jest piękne widok nad morzem.
This is a beautiful view over the sea.
Here, 'piękne' describes 'kwiaty' (flowers) and is in the plural nominative form, agreeing with the gender and number.
Te kwiaty są naprawdę bardzo piękne.
These flowers are really very beautiful.
In this instance, 'piękne' is used to describe 'uczucia' (feelings), which is neuter plural nominative, reflecting its role as a descriptor.