Storyboarding is a visual technique used in software requirements engineering to help understand user needs and system functionality. It involves creating a series of illustrations that show how a user will interact with a proposed system. Storyboards have benefits like communicating design ideas clearly and allowing feedback before development. Prototyping creates a mock-up of a proposed system to help validate requirements with users. Use cases are written descriptions of how users will perform tasks with a system. They define the actors, scenarios, and goals to help specify requirements.