A ferromagnet is a material that can become magnetized and retain its magnetic properties even after an external magnetic field is removed. This occurs due to the alignment of magnetic moments of atoms within the material, which can be influenced by temperature and external magnetic fields. Common examples of ferromagnetic materials include iron, nickel, and cobalt. Ferromagnetic materials are widely used in various applications, such as in the production of permanent magnets, magnetic storage devices, and transformers. Their ability to maintain magnetization makes them essential in electrical engineering and technology, contributing to the functionality of many electronic devices.