What is the term for a structured set of data that is held in a computer?

The correct term for a structured set of data that is held in a computer is a database. A database is specifically designed to efficiently store, manage, and retrieve large amounts of data, allowing for organization and connections among different types of data relationships. It uses a structured format, often with tables and queries, which enables users to easily input, update, and access information as needed.

In contrast, a spreadsheet is typically used for calculations and data analysis but is not inherently structured to manage complex relationships like a database. A document refers to files that contain text, images, or other content but are not organized in a way to facilitate relational data management. A file is a more generic term that can encompass any type of digital content, including documents, images, and databases, and does not specifically imply the structured organization associated with databases. Thus, the term database accurately reflects the organized and systematic nature of the data storage described in the question.