  The Cannonball Model is based on the hypothesis that GRBs and their
afterglows are made in supernova explosions by relativistic ejecta similar to
the ones observed in quasars and microquasars. Its predictions are simple, and
analytical in fair approximations. The model describes well the properties of
the $\gamma$-rays of GRBs. It gives a very simple and extremely successful
description of the optical and X-ray afterglows of {\it all} GRBs of known
redshift. The only problem the model has, so far, is that it is contrary to
staunch orthodox beliefs.
