What is Backlink Gap?
The Backlink Gap - aka Backlink Gap Analysis - refers to the difference in the number or quality of backlinks between your and competitor's websites.
Backlink Gap Analysis aims to uncover opportunities for improving your site's performance by comparing your backlink profile to that of your competitors.
If your competitors have more or better-quality backlinks, this gap may explain why they are outperforming you in search rankings. You then make strategies accordingly to fill up those backlink gaps.