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Hi Callum,
Website architecture is how your website navigation is structured. Siloing or how the information in your site is grouped around like terms is not necessarily the same thing.
If you have a shopping site for women’s clothes, its navigation structure may go:
Women’ clothes -> dresses -> maxi dresses -> individual maxi dress pages.
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.
Regs
JohnW