Which term refers to a unit of functionality designed to meet specific business needs?

The term that most accurately describes a unit of functionality designed to meet specific business needs is "Building Block." In the context of TOGAF, a building block represents a modular component that can be combined with other building blocks to create a comprehensive solution tailored to particular requirements. Building blocks can include various elements like applications, technology components, or even business processes, and they are essential for constructing solutions in a scalable and repeatable manner.

While "Architecture Domain" refers to a specific area of focus within architecture, such as business, application, data, or technology architecture, it does not signify a unit of functionality.

"Solution Building Block (SBB)" and "Architecture Building Block (ABB)" are both specific types of building blocks. SBBs focus on the implementation aspects of a solution and are more concerned with details needed for deployment, whereas ABBs are high-level representations that define a broader functionality or service within the architecture framework. Although these terms relate closely to units of functionality, they are subsets of the broader concept of a building block, which more generally encompasses all modular components aimed at addressing business needs.

In summary, the term "Building Block" encompasses a wide variety of functionalities and is particularly relevant when considering the holistic design and implementation of