The phenomenon known as electromagnetic interference (EMI) occurs when any device with electronic circuitry becomes exposed to an electromagnetic (EM) field. The broad electronic spectrum is being used by an ever-growing number of these devices, many of which will have EMI issues affecting their performance.
EMI will lead to poor operation, malfunctioning, and can even ultimately stop circuitry from working at all. Needless to say, system circuit designers need to design their architectures to prevent EMI disturbances that can negatively impact their electronics.