Ghost Hunt - going to a place were there have been no sightings of ghosts and trying to catch some on film (video and photos), sounds, eyewitness, etc. (graveyards are the number one place to start, churches, schools and older buildings too)

Ghost Investigation - going to a known haunted place and recording data (video, photos, audio, temperatures), notes, interviews and other evidence to prove/disprove the haunting and to assist the owners and the spirits in moving on and leaving the place if they want that.   The assistance can be either you directly assisting the owner with the situation or putting them in contact with experienced groups or individuals that  will try to resolve the situation.  Your assistance can be something as simple as educating them on what is going on and their options.

There are generally 2 types of spirits you may encounter.  One was a human at one time and it has remained on this level for some reason.  It may not know it's dead, may be held here by unfinished business, guilt, etc.  These spirits are like the person was when they were alive, so they could be good or bad, just like the living, but not normally dangerous.  This human spirit is the type you will encounter 95% of the time.  You could also witness a which residual haunting which is just a playback of a past event.  This is just like watching a video from the past playing over and over.

The other type of spirit you may encounter were never human and are generally bad news.  You must be aware of  this type but not obsessed with them, the chances that you will encounter them in a regular ghost hunt are slim.  I have experienced both types and I just want to make you aware of their existence.  So be aware and protect yourself and you should have no problem.