Inquiries about How booking sites collect information ? apis ?

I hope everyone is in good health. I just want to ask you how the reservation sites work, so how do you collect information about hotels, how to book them, how to know the available room and the date of their availability? if that works with apis how i can do something similar with laravel ? and is that possible ? and how to get much apis from deferents websites and fetch data ? exemple : https://booking.com thank you