What is the role of an electron in a circuit?

In a circuit, electrons serve as the primary charge carriers that flow through conductors, enabling the transmission of electrical energy. When a voltage source is applied, it creates an electric field that causes electrons to move from the negative terminal toward the positive terminal. This movement of electrons constitutes an electric current, which powers devices and allows for the functioning of electronic components. Essentially, electrons facilitate the transfer of energy and information within the circuit.