How, in photography, does exposure compensation work exactly?

So let’s say I’m shooting in aperture priority, with an ISO of 200,and the metering tells me the shutter speed should be 1/60th.
Watching live view I decide I think it look too underexposed, so I dial in 1ev+.
Now my question is: what happens in the camera, from a technical standpoint, when I apply that 1ev+?
It’s not ISO going to 400, right?
Neither shutter speed going to be changed to ⅓0?
Let alone a change in aperture (I’m in aperture priority, so I want a certain depth of field).
So, what’s making it go 1 stop brighter, I would like to ask.
Anyone?
Thanks in advance!