How capacitor are always connected in parallel?

One possible reason is to achieve a total value that isn’t a standard value.
Another reason is two small capacitors with a total equivalent capacitance to one large capacitor have a faster response time than a single capacitor.

Another reason may be each capacitor has a specific purpose. For example, a large value electrolytic capacitor placed on the output of a DC power supply can be used to smooth out the rectified waveform and also act as a reserve. A small value ceramic capacitor in parallel may act as a high frequency filter.

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Capacitor are connected in parallel because two small capacitors with a total equivalent capacitance to one large capacitor have a faster response time than a single capacitor.

Also, One possible reason is to achieve a total value that isn’t a standard value.

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