Special effects (often abbreviated as F/X or simply FX) are illusions or visual tricks used in the theater, film, television, video game, amusement park and simulator industries to simulate the fictional events in a story or virtual world. It is sometimes abbreviated as SFX, but this may also refer to sound effects.
Special effects are traditionally divided into the categories of mechanical effects and optical effects. With the emergence of digital filmmaking a distinction between special effects and visual effects has grown, with the latter referring to digital post-production and optical effects, while "special effects" refers to mechanical effects.