"Black ops" refers to covert or secretive military or intelligence operations that are carried out without official acknowledgment or public knowledge. Full definition
That said, I don't actually possess a copy of Black Ops at the moment. (riddlethos.com)
I will say that the twenty or so rounds of Black Ops III have gotten me far more interested in getting into this years game then I was prior to jumping in. (darkstation.com)
Zombies will once again play a huge part in Black Ops with this fourth instalment. (push-start.co.uk)