What is the purpose of a CMOS battery on a motherboard?

What is the purpose of a CMOS battery on a motherboard? cmos slot SLOT OR SIZE START LIBRARY PATTERN NO PRINT COLOR MATERIAL 45-102-10805 46 CMOS COLLATE BINDERY SPECIAL PREP INSERT MATERIAL BEN SEW NU 05 cmos slot CMOS AF II, 12 fps Mech Shutter, 40 fps E Shutter, Sensor-Shift 5-Axis Dual Slot: SDSDHCSDXC Video IO 1x Micro-HDMI (Unspecified

cmos slot slot Everything worked fine, I loaded Windows 11 Pro, and all drivers, updated BIOS 92809 92810 System Specs: 92811 OK, after updating system I pulled

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