It’s only relevant at quantum scales, so it’s not something we can experience directly. The super oversimplified version is that imaginary time is what light is doing while it moves through a medium where it can’t travel at light speed. Light always travels at light speed, but it can pass through infinitessimally small closed loops of time where the light isn’t interacting with anything but is nevertheless delayed by things it might have interacted with.
It’s only relevant at quantum scales, so it’s not something we can experience directly. The super oversimplified version is that imaginary time is what light is doing while it moves through a medium where it can’t travel at light speed. Light always travels at light speed, but it can pass through infinitessimally small closed loops of time where the light isn’t interacting with anything but is nevertheless delayed by things it might have interacted with.