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I'm mainly interested in Google, but any information about different search engine will be highly appreciated.
Thanks in advance,
Anyone know what the source of Google's related keywords comes from?
I'm guessing they just compile associations from query history.
Like if you type "widget" - they check all past queries with a word widget in it and show you the list.
blue widget, nice widget, horny widget, etc...
To take it one level deeper:
In the secondary list they might pick the associated keywords and try to determine how broad they are.
blue widget -> blue, the word blue was used in a large number of queries without the word widget - it's too broad.
widgetspecattribute widget -> widgetspecattribute, mostly used with a word widget in the same query - it's not broad; get associations for the word widgetspecattribute.
The same priciple can be applied to the index database to see the word associations in the indexed documents instead of queries.