Active electrode is a term used in the field of electrical engineering to denote an electrode that generates electrical activity. It is commonly used in various applications, including medical devices, electroencephalogram (EEG), and electrocardiogram (ECG) devices. However, there are other synonyms for this term, such as active contact, active lead, active terminal, and active site. An active contact refers to an electrode that senses and generates physiological signals, while an active lead denotes an electrode that delivers electrical currents to a specific region. Active terminal refers to a portion of the electrode that is actively detecting or stimulating, and active site is a site at which electrical activity is generated.