What is dmesg command and how to use it in Linux/Unix?

dmesg (Display message or driver message) is a command which will show Kernel ring buffers. These messages contain valuable information about device drivers loaded into the kernel at the time of booting as well as when we connect a hardware to the system on the fly. In other words dmesg will give us details about hardware drivers connected to, disconnected from a machine and any errors when hardware driver is loaded into the kernel. These messages are helpful in diagnosing or debugging hardware and device driver issues. Already covered command in the series is

Get BIOS, Firmware, Hardware And Drivers Details in Linux/Unix
dmesg command syntax
dmesg options
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