The AFCI circuit breakers are for rooms that are likely to have extension cords or long wires plugged in, like bedrooms, living room, and dining room. These are designed to trip for an ARC from a pinched or worn wire or cord which can cause a fire. The GFCI breakers or GFCI outlets are located where water may be present, outside outlets, bathroom, garage, and kitchen. These are designed to detect possible current flow from failed insulation to ground and work around 5 milliamperes. These protect the user from electrical shocks.
You should not have both on the same circuit (my understanding).
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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