A YouTube video script refers to a structured outline detailing the dialogue, visual elements, and calls to action for a video, serving as a blueprint to ensure clarity, engagement, and consistency. In practice, it guides creators through the production process, helping maintain focus, deliver a coherent message, and enhance viewer retention. Crafting an effective script involves understanding the target audience, defining clear objectives, and incorporating a compelling narrative with a strong opening, informative content, and a persuasive conclusion. Key considerations include maintaining a conversational tone, integrating visual cues, and including clear calls to action to encourage viewer interaction.