What type of documents does a heat map help identify?

A heat map is a visual tool used in data analysis that highlights the intensity of certain characteristics or data points, which can be especially useful when examining large sets of documents. In the context of analytics and data management, a heat map helps identify clustering documents with high relevance by illustrating where concentrations of related data occur.

When analyzing document sets, a heat map can show which documents share common themes, terms, or features that make them particularly significant for a given analysis. This allows analysts to quickly discern relationships and connections among documents, thereby determining which are most relevant to the specific inquiry at hand. By providing this visual cue, a heat map enhances the efficiency and effectiveness of the document review process, allowing stakeholders to focus their attention on the materials that matter most.

The other types of documents mentioned, such as duplicate documents or unused documents, do not inherently align with the primary function of a heat map, which emphasizes relevance over mere count or usage.