Published 03-31-26
Keyword Density in Modern SEO: From Query Prediction to Semantic Matching
Keyword density, or keyword frequency, has long been a fundamental part of SEO and document retrieval systems—and for good reason. The rise of large language models (LLMs) does not eliminate keyword density; instead, LLMs reinforce keyword density's role as a tenured element of SEO, because LLMs need unambigous content structure, which may not be possible with pronouns.
Keyword usage signals what a document is about and enables prediction of which queries it can match. Rather than a fixed value, keyword density operates as a range that varies by topic, intent, and available semantic variation.