This is the 10710th most frequent German word.
roberto
"Roberto" is not a German word; it is a male proper name.
Here, 'Roberto' is used as a proper noun referring to a person's name.
Roberto ist mein bester Freund.
Roberto is my best friend.
In this sentence, 'Roberto' is used as the title of a film, showing a cultural reference.
Ich habe heute einen Film namens 'Roberto' gesehen.
I watched a movie called 'Roberto' today.
Here, 'Roberto' is part of the title of a song, showcasing its use in artistic works.