Definition
A Disclosure Gap is what happens when Google tells you the total number of search visits, but does not show all of the searches that created those visits. For AS400System.com analysis, this matters because aggregate clicks can land on commercial IBM Power, AS/400, hosting, pricing, and support pages even when Google withholds the exact matching queries.
The gap is calculated by comparing total GSC dimensions, such as page or day, against Google-disclosed query dimensions for the same date range. It does not recover the hidden search terms, but it keeps the hidden traffic from being counted as zero.