The document discusses modular computing standards including StackPC, PCIe/104, and PICMG. It describes key features such as modular systems with connectors on module sides and enclosures. Profiles are defined for connector pin assignments to support interfaces like USB, Ethernet, and PCIe. This allows for new configurations and interfaces to be added like USB 3.1 and analog circuits. Standard interface modules can be installed on stacks and connected to enclosure front panels.