deep focus of visual effects

[bbergshoeff]

Hi guys and girls,

I have just watched The people vs OJ Simpson, in just three days. I liked it a lot, especially the cinematography.
I have a question about one of the shots i saw, Two people in the shot, one in close-up and the other in a chest shot (so there's distance), both of them are in focus but the background isn't. Is this deep focus or is it compisited?

Thanks!
The people vs OJ Simpson ep.10, i have a sceenshot but i'm not able to post attachments yet.