Afterlife... it's not a correct term, once you die you dead

Also, ghosts don't exist and do not fly around posing for photos
Now, the spiritual world is plausible, this is the place where angels and demons dwell but we will never see or capture a spirit because as humans we are not allowed such access.
According to the Bible the human being is constituted of soul (consciousness, its personality), body (mortal physical part) and spirit (the breath of life, which keeps you alive). When death comes, the body die and the soul rest, the spirit is immortal but belongs to God -
"and the dust returns to the ground it came from, and the spirit returns to God who gave it" Ecclesiastes 12:7
Roughly, to live after death you would have to be reborn with a new body(not reincarnate), awaken the soul and receive the breath of life, a truly privilege that not all will be worthy to receive unfortunately.
As a christian is what i believe in.