Hell is a reality. In order to understand Hell, you need to have an understanding of God. There is a God so great out there who absolutely loves you!
And all He wants is that you love Him back.
Heaven is to be with God. For eternity. Hell, in contrast is eternal separation from Him. It's a void. An emptiness that cannot be filled. It is darkness. The reason a person would go there is because they walk away from God. They turn their back and refuse His love. Hell isn't hate. It is a rejection of God.