What is a major source of radio frequency interference?

Radio frequency interference (RFI) primarily arises from electrical devices that emit signals, making this answer accurate. Many common electrical appliances, including microwaves, cordless phones, Wi-Fi devices, and even fluorescent lights, emit electromagnetic interference that can disrupt the operation of nearby electronic equipment. These devices operate at various frequencies, and when they emit signals, they can create unwanted noise that affects the fidelity of communication systems.

Natural phenomena, environmental factors, and incompatibility of wiring materials may also contribute to interference, but they are not the main sources like electrical devices are. Natural phenomena can include lightning strikes or solar flares, and environmental factors might consider physical obstacles or atmospheric conditions, but man-made electronic devices are far more common culprits in creating radio frequency interference in daily environments.