A sound effect is an artificially created or enhanced sound used in various forms of media, including films, television shows, video games, and theater. Sound effects can add realism, create atmosphere, emphasize actions, or enhance storytelling. They range from simple sounds, like footsteps or doors creaking, to more complex effects, like explosions or ambient background noises. Sound effects can be recorded in real life, synthesized electronically, or manipulated from existing sounds.