Final answer:
The Greeter is the position responsible for welcoming and greeting guests as they arrive. This role is vital for making an excellent first impression and enhancing the guests' experience.
Step-by-step explanation:
The position within the host job that is typically responsible for opening the doors and greeting guests as they arrive at a restaurant or event is known as the Greeter. While the Head Host or Seater may also interact with guests, it is the primary responsibility of the Greeter to welcome guests with a friendly greeting as they enter. This role is crucial in establishing a positive first impression and setting the tone for the guests' experience.