What you need to know about Raspberry Pi 3 power supply
Raspberry Pi 3 is not a very demanding computer. It works from just 5 volts and 2.5 amps. But the user of “Raspberry” need to make sure that the device receives enough energy. Otherwise, it will work slowly or completely fail.
Best Raspberry Pi power supply
why you should look for the Best Raspberry Pi power supply ? Choosing the power supply will determine if experimenting and working with Raspberry Pi will be a nuisance or if you can have many successful experiences. In particular, anyone who has an application for which Raspberry Pi should run continuously should carefully select the power supply.

Because not every power supply is equally suitable for Raspberry Pi. This is not due to Raspberry Pi, but to the power supplies that are either poor in quality or unsuitable for powering Raspberry Pi.
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