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Basically electrolytic capacitor is a polarised and the value will normally start from 1 microfarad (µF), meanwhile non electrolytic capacitor is non polarised and the value starts from picofarad (pF) ranges. The capacitors are choosen according to the capacitance required in a particular section of a circuit.
1 mF (millifarad, one thousandth (10−3) of a farad) = 1000 μF = 1000000 nF
1 μF (microfarad, one millionth (10−6) of a farad) = 1000 nF = 1000000 pF
1 nF (nanofarad, one billionth (10−9) of a farad) = 1000 pF
1 pF (picofarad, one trillionth (10−12) of a farad)
