Content Gap
Topics, keywords, or subtopics that competitors rank for but your site does not, representing missed traffic opportunities.
Definition
A content gap is the difference between the topics and keywords that competitor pages cover (and rank for) and those that your content does not address. Content gap analysis is a core SEO research technique that identifies specific opportunities where your site is missing coverage relative to top-ranking competitors, allowing you to prioritize content creation around high-opportunity gaps.
At the keyword level, a content gap exists when a competitor ranks in the top 10 for a keyword relevant to your business but you have no page targeting that term. At the subtopic level, a content gap exists when your page on a given topic is shallower than the top-ranking page — missing subtopics, questions, or entity mentions that competitors cover. Semantic analysis tools (TF-IDF extractors, content gap analyzers) can surface these missing semantic elements.
The standard content gap workflow: identify your top 3–5 competitors for each content cluster, run a keyword gap analysis comparing your ranking keywords to theirs, identify keywords where they rank in the top 10 and you rank outside the top 50 (or have no content at all), and prioritize gaps by search volume, keyword difficulty, and relevance to your business. Content gap analysis is most effective when used to deepen existing pages (add missing subtopics) and to identify new page opportunities (entirely uncovered topics).