What is the Rule of Capacitor in AC and DC Circuit?

Capacitors are used for AC and it blocks DC.

Here is a detailed discussion about

What is the Rule of Capacitor in AC and DC Circuit?

In an AC circuit capacitors are used to couple decpouple circuits as capacitors passes Ac but not dc 

Capacitors are used in DC circuit as Filters, delay pulse, etc

Different type of capacitor work differently such as Ceramic cap,paper cap,Electrlytic cap,Oil bsed cap etc 

In amplifiers capacitors are used to bypass Ac and block dc to boost the signal as it is connected acros the emitter resistor.

In DC Circuit, Capacitors have many applications Like:

Voltage Level Stabilization.

Memory Cells

Touch Screen etc. etc.

In AC Circuits, Capacitor applications involve:

Cancelling out / Counter Checking Inductive Load Behaviour in an Electrical Circuit in other words Power Factor Improvement ..........

Phase Splitting like in Single Phase Motor