A "Bucket" is a term for a keyword-type that is associated with a group of other keywords.

It is represented on this website in Red and always in upper case.

When you click the "Bucket" button the list will show all of the buckets you have defined in your profile.

The Bucket, highlited in red, is the active bucket. This means when you click the "Keywords" button, after having selected a Bucket, you will be presented with all of the keywords for that Bucket.

If you want to view keywords from a different bucket, you just need to click on an alternate bucket in the list.

The Internet Globe Icon, in the list, when clicked, shows the root domain(s) we have found which correspond to the selected Bucket.