[Q] Question about sw update i keep getting

[SpanKyM3]

i keep defering this update everyday for my s3 i535 phone.my phone is only rooted.used odin & clockworkmod to do so back in june.it had tried to update on its own but failed guess due to my root.i have been getting this update for the past week to 2 weeks now.what is this update?So i have
Android Version 4.0.4
baseband version i535VRLF2
kernel version 3.0.8-618049-user
[email protected] #1
SMP PREEMPT FRI JUN 15 07:53:02 KST 2012


Dumb question,when you root it is only the kernel thats different?am new to whats what.