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Conventional current
The direction of current defined as the flow of positive charge; it is opposite to the direction electrons actually move in metal wires.
Electromagnet
A magnet produced by an electric current, typically using a coil of wire; its strength can be controlled by changing the current.
Electromagnetism
A fundamental interaction in which electric charges and electric currents produce electric and magnetic fields, and changing fields can produce each other.
Solenoid
A long coil of wire; when current flows through it, it produces a magnetic field similar to that of a bar magnet, with a strong field inside the coil.