What is the purpose of a "last call" in bars and restaurants?

The purpose of a "last call" in bars and restaurants is primarily to inform patrons that service of alcohol will soon end. This announcement serves as a courtesy to give customers a final opportunity to order drinks before the establishment stops servicing alcohol, allowing patrons to finish their drinks or order one last round. It helps create a smooth transition towards the end of the night and ensures that everyone is aware of the impending cutoff time for alcohol service, which is often mandated by law.

While encouraging customers to buy more drinks or promoting special offers may sometimes happen, the key intention behind the "last call" is to provide a clear signal about the end of alcohol service, ensuring that patrons can responsibly enjoy their final beverages before the establishment closes for the night.