Final answer:
To group values of a picklist field together in a report, the Bucket Field feature is used. This feature allows for creating categories or 'buckets' to organize data more efficiently without altering the actual data. It simplifies the reporting view and facilitates data analysis, differing from other options such as Formula Field, Summary Field, or Matrix Report.
Step-by-step explanation:
To group values of a picklist field together in a report, you would use the Bucket Field feature. A bucket field allows you to create groupings of record values without affecting their underlying data. For instance, if you have a picklist field with many values and you want to simplify the report view by categorizing them into larger segments, you can create a bucket field to classify these values into the desired segments or 'buckets'. This way, the reporting view becomes cleaner, and it is easier to analyze the data.
It is important to note that a Formula Field is different in that it is used to calculate custom equations based on other field values, while a Summary Field is used to perform totals, averages, counts, etc., on numerical data, and a Matrix Report is a report format that allows you to see data summarized in a grid against horizontal and vertical criteria.