How is a data model best defined?

The best definition of a data model is a conceptual representation of data objects, structures, and relationships. This definition encompasses the essence of a data model, which is to provide an abstract framework that illustrates how data elements interact and relate to each other within a system. It helps in understanding the data requirements, guiding the data architecture and database design.

A data model lays out the entities, attributes, and relationships needed for effective data management and analysis. It is crucial for ensuring all stakeholders have a clear understanding of how data is structured and organized, supporting various functions such as data integration, retrieval, and database design.

The other options, while related in some ways to data handling and usage, do not capture the comprehensive essence of a data model. For instance, a collection of spreadsheets is merely a tool for data storage and analysis rather than an abstract design framework. A visual diagram that represents only part of the data fails to provide the complete picture necessary for understanding relationships and structures in the data environment. Meanwhile, a set of rules for data entry pertains more to data governance and quality assurance rather than the overarching representation of data objects and structures that a data model provides.