What do user stories typically describe?

User stories are a fundamental component of agile methodologies, particularly in the context of requirement analysis and software development. They serve as a concise way to capture a user's needs and the value that a specific feature or functionality provides. Specifically, a user story typically describes the desired functionality in a brief textual format that emphasizes the user's perspective.

This format usually follows a simple structure, often distilled into the "As a [type of user], I want [some goal] so that [some reason]." By focusing on who the user is, what they want to achieve, and why, user stories facilitate a clear understanding of functionality from the end user's viewpoint. This focus helps development teams prioritize work based on user value and ensures that features being built truly address the needs of the stakeholders involved.

Other options do not align with the core purpose of user stories. For instance, detailed outlines of user interface designs or comprehensive lists of system requirements encompass elements that are generally more prescriptive and technical, which is not the intent of user stories. Additionally, describing the technical background of software functionality misses the key component of understanding user needs and behaviors. Therefore, the chosen option correctly highlights the essence of what user stories convey in agile practices.