Reports bucketing in Salesforce?

Hi Manpreet

Bucket field in Reports is used to group values to the name we specify.

It can group only the below data types fields

1. Picklist
2. Number
3. Text

for more information you can lookup here:http://www.infallibletechie.com/2013/03/what-is-use-of-bucket-field-in-reports.html

Hope it may help you: