Electromagnetic noise refers to unwanted electrical signals that can interfere with the operation of electronic devices. This noise can originate from various sources, such as radio waves, power lines, and even natural phenomena like lightning. It can disrupt communication systems, affect the performance of sensitive equipment, and degrade the quality of signals. In many cases, electromagnetic noise is measured in terms of its frequency and amplitude. Engineers often use filters and shielding techniques to minimize its impact on devices. Understanding and managing electromagnetic noise is crucial for ensuring the reliability of technologies like cell phones, radios, and computers.