'is BLANK' & 'is not BLANK'

How does "is BLANK" & "is not BLANK" filter work?

'is BLANK' filter condition is used to filter the blank records.

For Example: Filter all products that do not have any 'Variant Title'.

When 'is BLANK' filter is applied on 'Variant Title' field, the report will filter out all the products that does not contain 'Variant Title'.

'is not BLANK' filter has been applied to 'Variant Title' field to show all the row which have inputs added, as shown below.