<Dd> Application (or Component) architecture: The internal structure, the modularisation of software, within an application . This is software architecture at the lowest level of granularity . It is usually below the level of modularisation that solution architects define . However, there is no rigid dividing line . </Dd> <Li> Technology architecture / Technical architecture or infrastructure architecture: The structure and behaviour of the IT infrastructure . Covers the client and server nodes of the hardware configuration, the infrastructure applications that run on them, the infrastructure services they offer to applications, the protocols and networks that connect applications and nodes . </Li> <P> Note that the applications architecture is about the application portfolio, not the internal architecture of a single application - which is often called the application architecture . </P> <P> Many EA frameworks combine data and application domains into a single layer, sitting below the business (usually a human activity system) and above the technology (the platform IT infrastructure). There are many variations on this theme . </P>

There are several types of domains in the it infrastructure