There is no difference between an insulator and a non conductors. Both are just same with different names. There are just some particular insulators that show static properties, i.e. Getting charged on rubbing.
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i.e., insulators and non conductors urely resist current flow?
Both are the same.. Considering them different will only lead you to confusion. I am pretty sure no books says them to be diffrent. Yes, insulators resist flow of electrons i.e electricity through them.
thanq i jst got a confusion when i came to know that insulators can be charged by rubbing.thanks fr ure explanation

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Insulators do not allow charges to pass through.  They do not conduct electric charges.  Air, vacuum, wood, cardboard, cotton,  Helium are non conductors of electricity.  They can be charged by rubbing and static electricity is generated.

When we use a material for protecting the electric charges from leaking or protecting humans or animals from electric current,  we call it as an insulator.

When we describe a material or substance in terms of conductivity : we say conductor or non-conductor.  But all non-conductors may not be used as insulators.  Like air is a non-conductor.  Perhaps we don't use it as an insulator.  We may prefer some other material to air.

Semi-conductor  is a non-conductor for low voltages across its terminals.  When the voltage goes higher than a threshold voltage, then it conducts electricity and in fact, it gives out a higher current than that flows in to it.  Thus a semi-conductor  like Silicon, Germanium etc.  are used in electronic gadgets and computers to control flow of current and also to amplify current or signal.

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