Electromagnetic materials are substances that interact with electromagnetic fields. These materials can be classified into three main categories: conductors, insulators, and semiconductors. Conductors, like copper and aluminum, allow electric current to flow easily, while insulators, such as rubber and glass, resist the flow of electricity. Semiconductors, like silicon, have properties between conductors and insulators and are essential in electronic devices. The behavior of electromagnetic materials is influenced by their atomic structure and the arrangement of electrons. This interaction is crucial in various applications, including transformers, antennas, and magnetic storage devices. Understanding these materials helps in designing better technologies for communication, energy, and computing.