Q:

Fundamentals of Output Characteristics of a BJT, what is the difference between load line and output characteristics?

In any transistor, we plot the output characteristics, i.e. effect of change in Vce on Ic.
Next, we write the KVL equation on the transistor, i.e. Vcc = IcRc + Vce and plot the load line from this equation. 
So, now we have 2 relations between Vce and Ic - output characteristics and load line. 
Why do we 2 plots for the same 2 variables, when will each be used and what all do they signify?

A:

The transistor characteristics say what the transistor does.  The load line says what the resistor does.  The intersection of the transistor characteristic lines with the resistor load line says what the amplifier does.

