What type of magnet can be turned on and off by controlling the current through a solenoid?

An electromagnet is a type of magnet that can be turned on and off by controlling the current flowing through a solenoid. When an electric current passes through the wire coil of the solenoid, it generates a magnetic field, magnetizing the core material (often iron) inside. This magnetic field can be adjusted by changing the amount of current; increasing the current strengthens the magnetic field, while reducing it weakens or turns off the magnetism completely.

This ability to control the magnetism is what distinguishes electromagnets from other types. Permanent magnets, for example, have a fixed magnetic field that cannot be turned on or off with an electric current. Temporary magnets can exhibit magnetism only under specific conditions and typically lose their magnetism once the influencing factor is removed, while induced magnets become magnetized when in the presence of a magnetic field but do not maintain magnetism once the field is removed. None of these other types offer the same level of control in terms of being able to turn the magnetization on and off at will.