Electrolytic capacitors are ‘polarised’ which means they have a positive and negative lead and must be positioned in a circuit the right way round (the positive lead must go to the positive side of the circuit).
They also have a much higher capacitance than non-electrolytic capacitors.
Non-electrolytic capacitors usually have a lower capacitance.
They are not polarised (do not have a positive and negative lead) and can be placed anyway round in a circuit.
They are normally used to smooth a current in a circuit.
CAPACITANCE - means the value of a capacitor.
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