What are 'groups' used for in reports within Access?

Groups in reports within Access are utilized to organize data into sections based on common field values. This functionality helps to categorize and summarize information, making reports easier to read and interpret. For instance, if you have a report on sales transactions, grouping by a common field such as 'Product Category' can allow users to see totals and details related to each category, providing a clearer understanding of the data.

This grouping capability enhances the report's structure and lets viewers quickly identify patterns and differences in the data, facilitating better insights and decision-making. It is an essential feature for creating organized, meaningful reports that effectively communicate the necessary information.