In agile development, a 'User Story' is recognized as a short, clear description of a single requirement from the perspective of the end-user or customer. This format emphasizes the importance of user goals and provides context regarding how this requirement delivers value to the user. User stories typically follow a simple structure, often framed as "As a [type of user], I want [some goal] so that [some reason]." This approach encourages collaboration and communication within the development team and stakeholders, facilitating a shared understanding of what is needed.
By contrast, other options do not align with the core principles of user stories. A lengthy specification document would be contrary to the agile principle of valuing working software over comprehensive documentation, as it can lead to misunderstanding users' real needs. A detailed technical requirement focuses more on the implementation side rather than on the user’s perspective and does not encourage flexibility in development. A roadmap for software release planning provides an overview of the project timeline and deliverables but does not capture the individual needs or requirements of users as user stories do.