What is the difference between Columns and Fields?
One column represent a set of values of particular record field on the screen with a table view of all records in the storage. If you see list of records this means that all fields in this list are organized vertically as columns. If you click View record you will see one particular record and all fields of this record with names you have given for those columns on the storage settings page. Technically every record in the storage have a set of fields, not columns.