The value of the capacitor is usually between 100nf and 10nf. When you combine these two capacitors together youll be delivering a smooth uninterrupted voltage to your ic to work with.

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All decoupling capacitors should connect to a large area low impedance ground plane through a via or short trace to minimize inductance.
Decoupling capacitor high frequency. When working with decoupling capacitors in your own design keep these three things in mind. For the best results the decoupling capacitor should be placed as close as possible to the chip. Zlocalizes the noise in the system.
The key to using multiple capacitors for high frequency decoupling is to 1 make them all the same value and 2 spread them out around the ic do not place them together. If you want to be ultra conservative. At these higher frequencies ceramic capacitors provide better decoupling.
Since decoupling capacitors are going to allow the noise that lies near the self resonant frequency to pass it is valuable to know the frequency of the noise. In these applications the decoupling capacitors are often called bypass capacitors to indicate that they provide an alternate path for high frequency signals that would otherwise cause the normally steady supply voltage to change. Assuming a sufficiently large cap for transient current the rule of thumb is one 01uf001uf per supply pin for high frequency decoupling.
So the most used type of decoupling capacitor is a 100nf ceramic capacitor. Besides power supplies decoupling capacitors also have other uses. Typically for decoupling capacitors ceramic capacitors are the predominant type used.
The reason that this works is that when equal value l c networks are placed in parallel the total capacitance is equal to nxc and the total inductance is ln where n is the number of capacitors used. However usually 100nf capacitors are used most commonly. This one will help to smooth out any of the high frequency noise in your circuit.
Optionally a small ferrite bead in series with the supply pin. This solution can be a single capacitor or several capacitors placed in a bank. Zthe purpose of this capacitor is to short the high frequency noise away from the chip.

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