RNA agarose gel electrophoresis?

In a practicle, RNA from Hep-2 cells were extracte and a260/a280 was 1.655. RNA was qualifed by loading a sample on to agarose gel electrophoresis, an image was printed. There was three bright bands. the second band was thicker than 3rd band and first band was thiner than the other two with a bit buldging out at sides . Please exlain what bands mean. Thanks