The way the Bible describes hell is to convey to mortals what can happen to an immortal soul that finds itself in eternity without having received God's free gift of a pardon that would have kept it out of hell. Just as heaven is described as a place of bliss too lovely for words to convey, so hell is described as a place of such awfulness, we should do everything needed to avoid ending up there.
Hell is the consequence of ignoring God and His free provision of a pardon from sin. The Bible warns that "Whatever a man is sowing, that he will reap." Also, "They have sown the wind, they will reap the whirlwind." Enter into the spirit of this kind of language. Something immense is being warned about, so the strongest possible words are used to alert us to an immense danger, yet how can mortals grasp what immortal states lie ahead, once we step out of time (at death) and enter eternity?
Jesus came from Heaven, to become a man, to draw us to God. Those who will not be drawn to the love of God will have an eternity without the love of God. And that will be hell. Those drawn to God walk in His light. Those who shun God walk in darkness - "blackest darkness" the Bible warns, reserved for wicked ones. Fire seems to contradict darkness but not in the spiritual realm spoken of. Have you never heard of 'burning with shame', or being 'as black as sin'? Jesus came to save us from that. Those who will not be saved will suffer the consequences in another universe, one of whose dimensions is a state called hell. You really don't want to end up there. Not when you think about it. Of course, if you don't think God exists, you can hardly rage against a concept called hell that you also insist cannot exist. Do think about that.