capacitor in electronic circuits

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what is the difference between coupling and a normal capacitor? Why the input is given to capacitor and then to transistor in a circuit? When the capacitor is connected to the input it will charge.. then how the input is given to circuit?
 

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here is the same discusstion about the coupling capacitor for your reference.

SOPPCB
 

They're both normal capacitors. They just call it a coupling capacitor when you want to connect two points with a capacitor. Normally that is in circuits where you only want to couple AC voltage, but not the DC part. So you couple them by AC and decouple DC. For example in audio amplifiers you don't want to have DC component in the input, because it would just stress the input amp.
 


the coupling capacitor is a normal capacitor in your terms which provides a least resistive path for the ac signal to enter the tranny the coupling capacitor also prevents the dc componet from distorting the op of the tranny
 

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