Electrodes are essential components in various branches of science and technology, particularly in the fields of chemistry, biology, and electronics. Essentially, electrodes are conductive materials that are used to make contact with a non-metallic part of a circuit. They are commonly used to transfer electrical signals or current between different materials. In the context of electrochemistry, electrodes play a crucial role in facilitating chemical reactions by serving as sites where oxidation and reduction reactions occur. In biological sciences, electrodes are utilized in techniques such as electroencephalography (EEG) to monitor brain activity, or in electrophysiology to study the electrical properties of cells. Electrodes can take various forms, such as metal wires, plates, or even microscale structures in modern technologies. They are typically made from metals like platinum, gold, or carbon, due to their excellent electrical conductivity and stability. Overall, electrodes are indispensable tools in a wide range of research areas and applications, enabling precise control and manipulation of electrical signals for various purposes.