Final answer:
ATX defines the layout, components, and connectors on the motherboard in addition to its form factor.
Step-by-step explanation:
ATX, in addition to defining the motherboard form factor, also defines the layout and dimensions of the components on the motherboard. It specifies the positions of the power connectors, expansion slots, and the types of connectors for peripherals like USB and audio.
For example, ATX motherboards typically have a 24-pin power connector and PCIe slots for graphics cards. They also include SATA connectors for connecting hard drives and SSDs, and USB headers for front panel or internal USB ports.
In summary, ATX not only determines the physical size and shape of the motherboard, but also provides guidelines for the arrangement and compatibility of various components.