ASRock B550 Steel Legend AMD AM4 ATX Motherboard

The motherboard or mainboard is the component that connects all the different parts of your computer. Often it has some integrated components like a sound card enabling your computer to play sound or a network card to connect your computer to the network. The standard form factor size for motherboards is ATX you need at least a midi-tower to fit one of those in. Micro-ATX motherboards are often more complete and have more onboard devices like a video board and fit in smaller cases but are generally less expandable.