Keyword Density
How often a term appears in the text, as a proportion of the whole.
Analogy Mental model
Salt in cooking. Too little and the dish is flat, too much and it is inedible. Nobody measures it with a spoon at the table.
In practice What you actually do
Fixed percentages are a relic. What works now is coverage: does the page use the vocabulary an expert in the subject would expect, in the places it would naturally occur. Read the draft aloud, and cut any phrase that repeats in a way you would not say it.
Where people get burned Pitfalls
The failure mode is unmistakable: our coffee maker is the best coffee maker because this coffee maker. Every reader sees it, every classifier sees it, and it makes an otherwise competent page look desperate.
This entry was written in English from the Chinese original, not machine-translated. Read the Chinese version →