This is the 18th most frequent Italian word.
hanno
"Hanno" means "they have" in English.
In this sentence, 'hanno' is used as an auxiliary verb in the present perfect tense (passato prossimo) for the subject 'they', indicating an action completed in the past.
Hanno comprato una nuova casa.
They have bought a new house.
Here, 'hanno' serves as the present tense of the verb 'avere', meaning 'to have', indicating possession for the subject 'they'.
Hanno molti amici a scuola.
They have many friends at school.
In this interrogative sentence, 'hanno' is the present tense form of the verb 'avere', combined with the noun 'questo libro', used to inquire about possession over time for the subject 'they'.