how do iframes work in terms of traffic?

Hi, new here...

I just want to ask about iframes. I have a high-traffic site and recently put up a new site. Site A now has contents from site B through an iframe. does it help the traffic of site B?

Google sees site A and iframed site B as 2 websites right? Does it mean that when i open the page from site A, site B automatically gets traffic?

how to iframes work for site A and site B in terms of traffic?

i think iframing is essentially the same thing as opening site B in a new window using a link from site A, as far as traffic and referrers are concerned.

so yea, both sites would get traffic.

but in my observation using GA, site A got more traffic than site B.

following that when someone visited site A, the count goes the same for site B. and when someone visits site B, it gets traffic on its own. so site B should get more traffic, right?