This is the 8269th most frequent German word.
joao
"Joao" is not a German word; it is a Portuguese name equivalent to "John" in English.
Here, 'Joao' is used as a proper noun, referring to a person's name, showcasing its function as a subject in the sentence.
Joao spielt gerne Gitarre.
Joao likes to play the guitar.
In this example, 'Joao' represents a person who is the topic or subject of the book, indicating its usage as an object of the preposition 'über'.
Ich habe ein Buch über Joao gelesen.
I read a book about Joao.
This sentence uses 'Joao' as the subject again, this time in a context discussing future events.