Question

what is paranormal activity?

Answer 1

Some activities occurring that are not normal are known as paranormal activity.
Hope it Helps

Answer 2

Paranormal means something which is beyond scientific or normal description.
Paranormal activities are those strange phenomena which even science can't tell the reason for, basically it's related to ghosts and spirits , their appearance and the influence they bring in the aura, these are nothing but hallucinations or perhaps Flatland type multiversic scenarios.