The kernel in OS X is the software architecture that is responsible for handling resources that processes and programs need. One regular culprit for using a lot of RAM is Safari, but in addition you will see another process called "kernel_task" that also will regularly use a few hundred megabytes of real RAM and seem to increase its RAM footprint with system usage. Seeing this in Activity Monitor can be handy for figuring out which tasks are taking up an unexpected amount of CPU or RAM. As expected, some processes will take up more RAM and CPU time than others.
If you launch the Activity Monitor utility on your Mac, you will be able to see what processes are running and what system resources they are using.
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