What is "it?" 3

It’s like a ghost since some people don’t believe ghosts exist while some does believe. Some thinks it’s almost impossible to be discovered. Some says it never exists. Some believes it exists but has never seen it; or A few people are scared of it although they have never seen it. Most people are chasing after it while some people are running away from it. Lastly, it sometimes just occurs in front of you despite your awareness. So, WHAT IS “it?”