Field lines are a term commonly used in physics and engineering to describe the lines that represent the direction of an electric or magnetic field. Synonyms for field lines include electric lines of force, magnetic lines of force, and flux lines. These terms all refer to the same concept of visualizing the behavior of a field through the use of lines. Other synonyms for field lines may include lines of induction, lines of influence, and streamlines. The variety of terms available for describing field lines reflects the broad application of this concept across various fields of study, including physics, engineering, and geology.