SEO
Keyword Difficulty
Quick definition
Keyword Difficulty (KD) is a tool-specific 0–100 score estimating how hard it will be to rank in the top 10 for a given keyword.
Most SEO tools (Ahrefs, Semrush, Moz) calculate KD from the backlink profiles of currently-ranking pages. Higher KD typically means stronger competitor link profiles.
Why Keyword Difficulty matters
KD is directional, not absolute. A 'low KD' keyword can still be hard if SERPs are dominated by major brands, and a 'high KD' keyword can be winnable with strong topical authority.
How Keyword Difficulty works in practice
Use KD as one input alongside SERP analysis, search intent, and your site's relative authority. Don't pick keywords on KD alone.
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Related terms
Keyword Research
Keyword research is the process of finding, evaluating, and prioritizing search terms users actually type, to inform content and SEO strategy.
Domain Rating (DR)
Domain Rating (DR) is Ahrefs' 0–100 score measuring the strength of a website's backlink profile relative to others in its index.
SERP
A SERP (Search Engine Results Page) is the page Google shows in response to a user's query, including organic results, ads, and rich features.
Keyword
A keyword is the word or phrase users type into a search engine — and the term SEOs target with content to rank for it.
Long-Tail Keyword
A long-tail keyword is a longer, more specific search phrase — typically 3+ words — with lower search volume but higher conversion intent.
Short-Tail Keyword
A short-tail keyword (or 'head term') is a 1–2 word query with very high search volume but high competition and broad intent.