Some call it storytelling; others call it an elevator pitch. Either is fine, and elevator pitches are good as long as you know that most people want to get off on the 2nd floor.
Developing a concise, compelling, and succinct message that clearly states the societal problem you’re working to address, how you will solve it, and what differentiates your work is a key factor in fundraising campaign success. Your case must be made clearly, quickly, be externally focused, and demonstrate urgency.