Final answer:
A suspenseful ending that leaves audiences questioning what will happen next is known as a cliffhanger, often used to maintain audience engagement and transition from the climax to the falling action without a clear resolution.
Step-by-step explanation:
A suspenseful ending that leaves you wondering is often referred to as a cliffhanger. This narrative device is typically used to keep the audience engaged and make them question what could possibly happen next. In the structure of a story, this falls after the climax and is sometimes part of or followed by the falling action.
The falling action is where the tension starts to wind down after the climax's peak action, leading towards the resolution. If there is no clear resolution or it leads to unresolved questions, the ending can indeed be a cliffhanger that leaves audiences eagerly anticipating the next installment or pondering the outcomes for themselves.