This is the 19th most frequent Spanish word.
han
"Han" is the third-person plural form of the verb "haber," meaning "they have" (used as an auxiliary verb in perfect tenses).
This usage of 'han' is as an auxiliary verb in the present perfect tense, where 'han' is used for the third-person plural to indicate 'they have'.
Han llegado temprano a la reunión.
They have arrived early to the meeting.
Here, 'han' acts again as an auxiliary verb in the present perfect tense, used for the third-person plural 'they have'.
Algunos estudiantes me han preguntado sobre el examen.
Some students have asked me about the exam.
In this case, 'han' is part of the present perfect continuous tense, indicating an action that started in the past and is still ongoing. It is used here for 'they have'.