MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors) are
active components.
An active component is one that can amplify or control the flow of electrical signals. MOSFETs can control the flow of current between two terminals (drain and source) using a voltage applied at the gate terminal. They can amplify signals and switch currents, which is why they are considered active devices.
In summary,
MOSFETs are active components because they can modulate electrical signals and require an external power source to operate.