CE is simply a amplifies the power because it amplifies both voltage and current
and gives an 180° out of phase output
while CC amplifies only voltage and gives an in phase output..
its bettr to understand with a circuit
you can try out the following link..
CE:-
It is an Common Emitter amplifier in which emitter is ground.we apply input at base and get the output from Collector.
CC:-
It is an Common Collector amplifier in which collector is ground.we apply input at base and get the output from Emitter.