Why do they call Harvey Dent two face in the movie The Dark Knight?

Saw the movie and Simply want to know why do they call him two face. Also, can I have a summary of it. You do not have to spoil it since I already saw it , it is just it is hard to figure out half the movie so if u get please explain to me why. Thanxs I mean that is Very hard to understand and to summarize but ... show more Saw the movie and Simply want to know why do they call him two face. Also, can I have a summary of it. You do not have to spoil it since I already saw it , it is just it is hard to figure out half the movie so if u get please explain to me why. Thanxs I mean that is Very hard to understand and to summarize but if u can that could be great. Thank u
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