What is the main purpose of conducting a safety briefing before a flight?

The primary purpose of conducting a safety briefing before a flight is to inform all personnel of safety procedures and emergency protocols. This briefing is essential because it ensures that every individual onboard understands what to do in case of an emergency, including the use of safety equipment, locations of exits, and the procedures to follow during various emergency situations.

By clearly communicating these safety procedures, the crew enhances the overall safety and security of the flight, helping to prepare passengers and crew members alike for any unexpected events. It creates a more informed passenger environment where individuals are aware of their roles and responsibilities during critical moments, ultimately contributing to the effective management of emergencies.

The other choices focus on aspects like entertainment, crew introductions, or reviewing the schedule, which do not directly address immediate safety needs or protocols important for the passengers and crew before takeoff.