What is class Q in airlines?

Usually there are only two classes for the passnegers....... business and economy class........

but if we talk about the classes from the airlines end than it has so many classes

like S,G,H,J,I,K,B,Y,U,T,E,W,Q,Z,V,N,D and some more....

And the difference between these classes is this that some comes in economy class and some in business.......

And Q class comes in economy class......

And there is a fixed fare for each class.... So as early you book you will get the cheaper fare............