It's a group of singers who did not manage to make it through to the Xfactor 2010 live finals individually, so they were told to form a group together. I think they have actually done well, since they only met during the Xfactor auditions in 2010.
I'm not really into the type of music they sing, but I think they have a decent amount of talent. I know girls who are just into the group, because of their looks, just like how lots of girls like Justin Bieber. But I think their music is better than Justin Bieber's by a bit.