The ASUS PRIME B840M-A WIFI-CSM is a micro-ATX motherboard designed for AMD Ryzen 9000, 8000, and 7000 series processors with an AM5 socket. It features Wi-Fi 6E, 2.5Gb Ethernet, DDR5 memory support, and PCIe 4.0/3.0 slots for high-speed storage and GPU performance. The "CSM" in the name indicates it's part of ASUS's Corporate Stable Model program, offering long-term stability and support for businesses.