I’ve only ever heard this term (Silo Architecture) from Bruce Clay but it basically means building a website around a particular theme/keyword so that all of the information is centralised around that theme.
Apparently, having a website with mixed themes/keywords hurts your overall ranking.
The same site could also offers a page that lists all red dresses that links from a red maxi dress page, a red mini skirt page, a red frock page, etc. That page would be a mini silo for searchers who included “red” and “dresses” in their search terms.
The silo approach has always resonated with me as it’s all about relevance, themes and focus.
A website section can be a silo as it covers a given theme and has pages within it that are focused on specific sub topics/keywords.
A human and search engine can gauge relevance and drill down as desired.
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