Hell is an abode which is a clear demonstration of the Wrath of Almighty Allah. That which has been mentioned in the Holy Qur'an and Ahadith concerning the description of Jahannam (Hell) is being briefly explained hereunder, so that we may take refuge from the Wrath of Almighty Allah and His punishment, and so that we may abstain from those actions that will lead us towards hell and its tortures.
Rasoolullah (Sallallahu Alaihi Wasallam) has stated, "Hell has been concealed in the pleasures of the world and paradise lies hidden in the hardships of life." [Bukhari Shareef ]
Looking at its physical nature, the fire of Jahannam was fanned for a thousand years until it became red. It was then fanned for another thousand years until it became white. It was then fanned for a further thousand years until it became black. It is now completely black wherein there is no sign of light. [Bahaar-e-Shariat] Rasoolullah (Sallallahu Alaihi Wasallam) has stated that this worldly fire is the seventieth part of the fire of hell. If one adds sixty-nine degrees of intensity to the worldly fire, it would equal the fire of hell. [Bukhari Shareef ]
The fire of this world is so intense that no one can bear to be burnt by it. However even this worldly fire begs Allah Ta'ala never to enter it into the fire of hell, yet amazingly man seems to have no fear of it and commits all those actions that would lead him to hell.
Hell has seven levels and each one has a big entrance. Referring to these levels Allah Ta'ala states in the Holy Qur'an, "It has seven entrances. For each entrance there is an appointed portion of them." [Surah 15, Verse 44] Every sinner will be in the separate place in accordance with the nature of his sins. The names of these seven levels are, Jahannam, Luzwa, Hutwamah, Saeer, Saqar, Jaheem and Hawiyah. [Tafseer Noorul Irfaan]