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why JFET is called the unipolar device as opposed to BJT ?

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desperado1

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unipolar device

why JFET is called the unipolar device as opposed to BJT ?
 

unipolar devices

BJT is a bipolar device, that is, it uses both electrons and holes for conduction. Minority charge carriers are the bases of conduction in BJTs (electrons conducting in P channel and holes conducting in N channel)

FET's are unipolar devices, only one of the charge carriers causes conduction. and furthermore it is the majority charge carriers that conduct in this device( holes conducting in P channel and electrons conducting in N channel)


For further information refer to
https://www.allaboutcircuits.com/vol_3/chpt_5/1.html
 
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