What is bus architecture in the data warehouse?

In the data warehouse, bus architecture is made up of the set of tightly combined data marts that gets their potential from fact tables and conformed dimensions.
Where,

1. Conformed dimensions

it is defined and implemented only once so that it is meant to be the same thing wherever it is being used.

2. Fact Tables:

which are conformed includes the things that derive revenue, profit, standard costs, and standard price.