The purpose of a brand architecture
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Brand architecture describes how an organisation's various products, services or sub brands genuinely relate to one another and to the master brand overseeing the entire portfolio, giving real structure to what could otherwise become a confusing collection of separately managed identities all competing for the same audience's limited attention.
A clear architecture helps audiences understand exactly what they are dealing with at a single glance, whether a particular sub brand is meant to stand largely on its own or draw directly on the credibility of its parent organisation, and it helps the organisation itself make genuinely consistent decisions about future new launches.
Without a deliberate architecture in place, brand relationships tend to accumulate rather haphazardly as new products and acquisitions are added over time, eventually producing a portfolio that even internal stakeholders struggle to explain clearly, let alone an outside audience encountering it for the very first time without any real guidance to work from.