This is the 359th most frequent Italian word.
de
"De" in Italian is an archaic or poetic form of "di," meaning "of" or "from."
'Di' indicates the subject of passion or interest, translating as 'about' or 'of' depending on interpretation.
Sono appassionato di musica classica.
I am passionate about classical music.
'Del' is a contracted form of 'di il' (of the), showing possession or source, and translates to 'of the' in English.
L'aroma del caffè riempie la stanza.
The aroma of coffee fills the room.
Here, 'di' (for which 'de' is an alternate form in some contexts) is used to indicate possession or association, translating as 'of' in this case.