Answer / guest

At time of insmod required o's brings in ram or updated the
kernen with the perticular device driver. At the time of
rmmod removes the o's by kmod it kills the process and
refresh the kernel.

Answer / rulingminds

insmod: insmod is a tool used to attach a module to the
running linux kernel. This will take the kernel object(.ko)
and takes all executable code and data sections of the .ko
and attach it to the running linux kernel.

rmmod: used to remove or deattach a module code from the
running kernel

see www.rulingminds.com/modprogpart1 &
www.rulingminds.com/modprogpart2

for in depth explanation of the Linux module programming

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