What is a joined report?

Answer: The joined report format lets you view different types of information in a single report.

Explanation:
A joined report consists of up to five report blocks, which you add to the report to create multiple
views of your data. For each block, you can add regular and
summary fields, create standard and cross-block custom
summary formulas, apply filters, and sort columns. A joined
report can contain data from multiple standard or custom report types.