Host families are important for international students.
Tips
usage
寄宿学校 (jìsù xuéxiào) = boarding school. 寄宿家庭 (jìsù jiātíng) = host family / homestay. The word implies temporary, dependent lodging — not renting your own place.
memory
寄 means 'to send/entrust' and 宿 means 'to stay overnight' — you're entrusting yourself to someone else's home for the night.