a sort of skeleton which can help in understanding and analyzing concrete software architectures which are instances
The characteristic form and detail of buildings from a particular historical period or school of architecture, e.g. The Romanesque style, The Bauhaus School, The Post Modern School, the Neoclassical style, etc.
Architectural style is a way of classifying architecture largely by morphological characteristics - in terms of form, techniques, materials, etc. However, this is not a holistic way of understanding architectural works because of the emphasis on the details of style. It overlaps with, and emerges from the study of the evolution and history of architecture, but it is slightly different in its emphasis.