2nd Router Or Modem To Maintain Network Security?

I was setting up cameras to port forward the other day and the IT guy for this restaurant said something about there being either 2 routers or 2 modems, (I think?) and put the cameras on the system in such a way that they maintained a certain level of security. He had a name for it. I believe the cameras were segregated from the rest of the network.

I was reading a little bit but wasn't sure exactly what he did. Does this sound like a DMZ?

Would something like this solve the security issues surrounding port forwarding, if so, I would like some more information to read up and down the road offer this.

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