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A powerbank is a portable device that can supply USB power using stored energy in its built-in batteries. Powerbanks usually recharge with USB power.
mAh: amount of mA × time at 5V ideally. Many manufacturers measure this at the voltage of battery inside, hence they show more than actual.
Simultaneous charging and discharging: need to specify if the powerbank can be used while it is charging.
Number of output ports: This specifies the number of devices that can be charged simultaneously.
Output current rating: This specifies the current rating that it can charge maximum. The higher the number, better the powerbank. This can vary from output port to output port.