Electromagnetic interference can be categorized as follows:
Narrowband EMI or RFI interference typically emanates from intended transmissions, such as radio and TV stations or cell phones.
Broadband EMI or RFI interference is unintentional radiation from sources such as electric power transmission lines.[4][5][6]
Conducted electromagnetic interference is caused by the physical contact of the conductors as opposed to radiated EMI, which is caused by induction (without physical contact of the conductors). Electromagnetic disturbances in the EM field of a conductor will no longer be confined to the surface of the conductor and will radiate away from it. This persists in all conductors and mutual inductance between two radiated electromagnetic fields will result in EMI.