DEFINITION: Architecture Building Block ABB is a Business Object constituting architecture model that describes a single aspect of the overall model. An Architecture Building Block describes generic characteristics and functionalities. Architecture Building Blocks are used to describe reference architectures, solution architecture templates or solution architectures of a specific solutions. Source: TOGAF (https://pubs.opengroup.org/architecture/togaf9-doc/arch/chap03.html#tag_03_8) EXAMPLES: The following implementation is an example on how this specific Architecture Building Block (ABB) can be instantiated as a Solution Building Block (SBB): "Support" can be considered an architectural building block, when it is used in the context of the designing of a software that should include online or offline support to users. Source:(https://www.brainkart.com/article/Functional-Requirements---Software-Architectures_11271/#:~:text=The%20following%20are%20examples%20of%20explicit%20architectural%20requirements%3A,Functionality%208%20Usability%209%20Reliability%20More%20items...%20)