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components such as motors and relays should ideally be powered by an independent source to prevent voltage sags that can cause logic errors in the microcontroller.Capacitors help stabilize power rails by providing a short-term current reservoir to smooth out voltage dips caused by component switching.A

Source : https://www.cyberwirehq.com/how-to-power-my-arduino-understanding-capacitor-integration-for-stable-arduino-power-supply-systems/

Power Delivery for Shields and Power-Intensive ComponentsEvaluating Power Supply Capacities for Modules and ShieldsAdding shields or extra modules onto a board multiplies the demands placed on whatever is supplying power.