What is what does no host bar mean?

"No Host Bar" translates to guests being responsible for purchasing their own alcoholic beverages. The term is used mainly in weddings and other events where the hosts do not provide alcohol. This implies that while the event's hosts cannot afford to offer alcoholic beverages to all the guests, the invitation still stands and does not want to offend by excluding those who would like to attend the event but cannot afford to purchase their own drinks. In summary, it means the host will not provide beverages or the guests who want to drink will have to buy their own alcohol.