With no optical drive and no DVD startup disk, can you reboot the 2012 iMac?

Okay, what if the OS becomes corrupted and the iMac 2012 crashes? Will it reboot? How can I reboot without a startup DVD disk?

Secondly, I am uncomfortable with cloud computing. Must I have an Internet connection to restart the iMac? What if the problem will not allow access to the Internet?

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