What are LSI Keywords?LSI (Latent Semantic Indexing) keywords are terms and phrases that are semantically related to a target keyword and commonly co-occur with it in high-quality content on that topic. The term originates from Latent Semantic Indexing, a mathematical technique for identifying relationships between words and concepts. In practical SEO usage, LSI keywords
What are LSI Keywords?
LSI (Latent Semantic Indexing) keywords are terms and phrases that are semantically related to a target keyword and commonly co-occur with it in high-quality content on that topic. The term originates from Latent Semantic Indexing, a mathematical technique for identifying relationships between words and concepts. In practical SEO usage, LSI keywords refer broadly to related terms that signal to search engines that your content comprehensively covers a topic, not just the exact match keyword.
For example, if your target keyword is customer churn, LSI keywords might include customer retention, churn rate, MRR, subscription cancellation, customer success, net revenue retention, cohort analysis, and product-led growth. These terms naturally appear in comprehensive content on customer churn and signal to Google that your content has appropriate depth and context.
How to Find LSI Keywords for SaaS Content
Practical methods for identifying LSI keywords include: scrolling to the bottom of a Google SERP for related searches, using Google autocomplete suggestions, analyzing People Also Ask boxes, running your target keyword through tools like Clearscope or Surfer SEO to see semantically related terms in top-ranking content, and reviewing the subheadings of the top 5 ranking articles to identify subtopics they all cover.
Frequently Asked Questions
Are LSI keywords a direct ranking factor?
LSI keywords are not a direct ranking factor in Google algorithms, which use more sophisticated neural language models than original LSI mathematics. However, the concept remains practically useful: content that naturally includes semantically related terms is more likely to comprehensively cover a topic, which correlates strongly with higher rankings. Think of LSI keywords as indicators of comprehensive topic coverage, not magic ranking terms to stuff in.
How many LSI keywords should I include in a SaaS blog post?
There is no target number. The goal is natural, comprehensive topic coverage. If you are writing about customer churn for a SaaS audience, terms like retention rate, MRR, and cohort analysis will appear naturally if the content is genuinely expert-level. Use SEO writing tools to identify significant gaps (important related terms completely absent from your content), then incorporate them naturally into expanded sections rather than forcing them in.