Boot from CD with a Mac computer

I know this is a super-FAQ, but for some strange reason I cannot remember how to do this every time I need it. So, here it goes:
Simply reboot your Mac with the desired CD into the drive, and press and hold down, while rebooting, the Option key, aka ALT, aka the button between Ctrl key and the Command Key (aka Apple Key). You can now choose to boot from the CD.That’s all.