If you are a beginner in guitar playing, then you may be confused by the guitar amp’s specification like ‘50 watts, class A’. Guitar amplifiers are divided into five classes that depend mainly how the device handles the electric current.
Class A amp is very fast in response as current continuously flow within it even in idle condition. In class B current will be zero in the idle state, and it has to change its state when the signal is present. Class AB is the combination of class A and B amps. It is the most popular amps for its simplicity.
Class D and H are light weight and efficient amplifier. If you get confused which one is better for you, then you can refer kicker amp reviews
for further help.