What is EMI?

EMI: Electromagnetic Interference 
Electromagnetic interference (EMI) is a phenomenon that may occur when an electronic device is exposed to an electromagnetic (EM) field. It affects an electrical circuit and electronic malfunctions.
With more people using electronic devices like cell phones and computers, there is a higher density of electromagnetic currents in the environment. As more and more electronic devices get developed and used, the impact of EMI continues to grow. You may have heard about EMI before and wondered exactly what they were. Although we cannot see or feel EMI, it can be detected and measured with instruments. And that's why the International Special Committee on Radio Interference (CISPR) set up the technical publications covering measurement and recommended emission limits to deal with the emerging problem of EMI.
Types of EMI (Electromagnetic Interference)
Electromagnetic Interference can arise in many ways and from different sources. Typically, there are two types of EMIs: Naturally occurring EMI and Man-made EMI.
✦ Man-made EMI
This type of EMI occur as a result of the activities of other electronic devices in the vicinity of the device (Receiver) experiencing the interference, such as cellular networks, television transmissions, radio and satellite. Some industrial and medical equipment causes of EMI affect technologies within the same facility or process, while others like grid power interruptions that can cause more widespread disruptions.
✦ Naturally occurring EMI
It is caused by natural sources of EMI, such as lightning, rain spray, solar radiation, electrical storms, cosmic noises and other atmospheric types of noise occurrences. 
✦ Other Sources
It is also possible to categorize the different types of EMI by their bandwidth, transmission routes and other external sources.
EMI Effects on The Performance of Electronic Circuit
Depending on the severity of the disruption, EMI may impact the quality of the signal the device receives, cause a component to fail or malfunction temporarily or permanently damage the electronic devices. There are several ways to reduce noise in an electrical circuit.
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