A bromance is a close non-romantic relationship between two men. The word is made up from 'bro' (brother) and 'mance' (romance).
*Louis, peasant. LOL, JK but seriously. Spell his name right. His bestfriend from the band is Harry. But since the Larry shippers went a little to far with shipping him and Louis and Harry as more then a bromace, Louis tweeted its "the biggest load of bullsh•t ever". So their friendship hasn't been the same but yeah. (I'm a Larry Shipper though. Bravery Bi•ches)