What is electronics?

In an electrical circuit the current flows through the conductors and components naturally, having the current a value that depends on the components connected in the circuit.

In the electronic circuit, a control is exercised over the flow of the electric current.

But this is not new, just put a switch to let flow or not the current through a light bulb. (In this way, we would be “controlling” the flow of current through the bulb).

However, the most important difference lies in the “how” this current flow is controlled. In an electronics circuit, an electric current flow is controlled by another electrical signal, this being another electric current flow or a fixed voltage.

In other words:

In an electronic circuit … electricity is able to control electricity.

Information extracted from here