Electromagnetism is a fundamental force of nature that unifies electricity and magnetism, describing the interaction between electric charges and currents. It establishes that moving electric charges generate magnetic fields, and conversely, changing magnetic fields induce electric currents. This force dictates that electric fields exist due to the presence of static charge, while magnetic fields are produced by time-varying electric fields. The interplay between these fields allows for the transmission of energy through electromagnetic waves, which propagate through space. Understanding these principles is foundational to modern physical sciences and technological applications, underpinning phenomena such as induced currents and the operation of various electrical devices.