Ironman

Ironman is a Profile type where the user cannot directly interact with players. This includes Trading, the Auction House, the Bazaar, receiving Gifts, or picking up player drops. Normal profiles cannot pick up an Ironman's drops either, however they can gift gifts.

Ironman profiles are much harder to play on, not having access to the auction house and bazaar. Most everything that you would use them for is hindered, so you have to grind everything yourself. For most players, ironman profiles might get boring after a while, because the mid-lategame experience is so much longer, but it's a great option for veterans who have everything in the game on another profile.