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Resetting the SMC works slightly differently on older MacBooks, which offered removable batteries. If your Mac runs slowly even when Activity Monitor doesn’t show a lot of CPU usage, and you’ve tried a number of other steps, resetting the SMC might help. But problems with the SMC can also occasionally affect system performance. If any of these functions are behaving oddly, resetting the SMC could solve it.

Selecting an external (instead of internal) video source for some iMac displays.

Status indicator light (SIL) management.

Responding to the display lid opening and closing on Mac notebooks.

Responding to presses of the power button.

Here’s a complete list of what the SMC does, straight from the Apple website :

For example: when you plug in the power supply for your Mac laptop, the lights on the charger work even if your Mac is completely shut down. Some functionality of your Mac works regardless of whether it’s turned on.

Mac desktops, meanwhile, basically just need to be unplugged. Any Mac laptop made since 2009 doesn’t have a removable battery, meaning you’ll need a keyboard shortcut to get the job done. The exact method for doing this varies depending on your Mac.