Why Ghost exist?

Many people ask why ghosts exist. Some people, may be wondered is it related to spirits. :) However, both ghosts and spirits the same thing, and if not, what is the difference between the two? o.o

Ghosts
Ghosts are considered to be disembodied people who appear in the earthly realm to people as manifestations, poltergeist activity, voices, etc... Most people tend to associate ghosts with Halloween or severely haunted places. But do ghosts really exist, and if they do, why are they here? Are they here to haunt the living or are they really here to haunt at all?

Spirits
The word spirit is a term used for spiritual beings like spirit guides, angels or other spirits who have a special purpose and are here to help the living with various things. Spirits are considered to be 'good', while ghosts are usually seen as unwanted visitors who only want to wreak havoc on the living. So which would be the correct term to use when discussing a disembodied person who continues to exist among the living?

The Debates
Among paranormal enthusiast groups, the difference between spirits and ghosts comes up as a topic quite often, and can lead to round and round discussions about who is right and who is wrong when it comes to defining the difference between the two. Some would say that a ghost is any spirit who has come back from the dead to haunt a person, place or thing, and it's a ghost regardless of what it's intentions are. Others would say that spirits and ghosts are the same thing, with no difference between the two.

Why Ghosts Are Here
Ghosts that tend to stick around could be caught between two worlds-their world-and ours. They might have unfinished business with a loved one, friend or even business partner. Some ghosts can be attached to a house they lived in, an object that they held so dearly to them while alive, or have some anger or sorrow that they took with them when they died. Ghosts can also be unaware that they have even died. Ghosts are often thought to be residual- leftover energy that is simply re-playing an event in time. But residual doesn't equal ghost, it equals leftover energy, like a blueprint that is frozen in time. Residual activity isn't interactive, it's just a movie that constantly replays over and over.

Why Spirits Are Here
If spirits are angels or spirit guides, then they would be here to help out the living when needed, during times of trouble or on a daily basis, through stress or sorrow. But there is perhaps another type of spirit who isn't a ghost, who can be seen or felt by people-the every-day spirit of a person who simply passed away. These spirits could be your grandmother who passed away, an uncle, a husband, a friend or anyone else that once lived but no longer has a physical body. These spirits aren't 'stuck' as a ghost could be, and they don't have unfinished business. They just want to visit. They want to visit the people who they love, who they shared a life with. They want to see the house they lived in as a child, or have come to attend a special occasion in the family like a birth or wedding. These are the spirits of people who have free will to come and go between here and the other side.

This is a video of actual photographic evidence of the a paranormal. These ghostly figures and other paranormal phenomena were captured during various investigations by Halo Paranormal Investigations based out of Nashville, Tennessee, USA. These photos are evidence of existence of the spirit world. So enjoy, people! :D

source : http://lisa-hoskins.suite101.com/why-ghosts-exist-a25551