What is the difference between AC and DC capacitors ?

There are no specific AC or DC capacitors.  All capacitors can be used in DC applications.  In AC applications, only non-polarized capacitors which do not have polarity should be used.  Electrolytic capacitors are examples of polarized capacitors.  

These capacitors have a fixed polarity and should never be used in AC circuits. Other capacitors such as paper capacitors, film capacitors, air capacitors are non-polarized and can be used in both circuits.  

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