A microvolt (µV) is a unit of electrical potential equal to one-millionth of a volt. It is commonly used in fields like electronics and biomedical engineering to measure very small voltages, such as those produced by biological signals in the human body. Microvolts are crucial in applications like electrocardiograms (ECGs) and electroencephalograms (EEGs), where the electrical activity of the heart and brain is recorded. Understanding microvolt measurements helps in diagnosing various medical conditions and in the development of sensitive electronic devices.