Movie 1(2003,Dinosaur Planet) Predict comparisons

MATLAB:
plot(x,movie1_svd,'g',x,useraverage,'r--',x,movieaverage,'k:');
legend('svd','useraverage','movieaverage');
title('Movie1(2003,Dinosaur Planet) prediction comparison');
xlabel('User Id(not sequential)');
ylabel('Movie Rating - predict value');

I don't know why I have this idea to plot this diagram, just want to know the relation of SVD, useraverage, movieaverage.