Diablo 3 features a four difficulty system, whereas its forerunner only had 3 difficulties. In addition to the standard difficulty sets of standard, nightmare, and hell, Diablo 3 adds in the Inferno difficulty when you beat Hell. Inferno is a good deal more demanding than the other difficulties. It is supposed to be the final test of your Diablo 3 resolve. It's estimated that merely a tiny share of Diablo 3 players will ever beat the last act of the Inferno difficulty setting.
Inferno is an enormous step up from the Hell difficulty for a number of factors. Your resistances actually matter for the very first time once you arrive at Inferno. Elemental and other non-physical damage types shall be coming at you from a diversity of sources. Simply having high armor or even vitality statistics won't be enough to create it through inferno. Without massive quantities of resistances you will be spending the vast majority of your time waiting to revive.
One more reason Inferno is so tough is because the unique and champion mobs have 4 properties on them. It is simply not uncommon to discover a bunch of champion mobs with a property mixture such as jailer, vortex, arcane, desecrator. These huge combinations can cause enormous problems for players, from time to time forcing them to reload the game and wish for a different combination.
The game shifts swiftly into more like a team dynamic when you arrive at Inferno. It is just too hard to advance forward alone with all of the increased difficulty. With the aid of your fellow players, you may work together to defeat the greatest challenges Diablo 3 has got to offer in its new Inferno Difficulty setting.