The illusions used in the film, television, theatre, or entertainment industries to simulate the imagined events in a story are traditionally called special effects (often abbreviated as SFX. Special effects are traditionally divided into the categories of optical effects and mechanical effects.
Optical effects (also called photographic effects) – are techniques in which images or film frames are created photographically, either "in-camera" using multiple exposure, mattes, or the Schüfftan process, or in post-production processes using an optical printer. An optical effect might be used to place actors or sets against a different background.
Mechanical effects (also called practical or physical effects) – are usually accomplished during the live-action shooting. This includes the use of mechanized props, scenery, scale models, pyrotechnics and Atmospheric Effects: creating physical wind, rain, fog, snow, clouds etc. Making a car appear to drive by itself, or blowing up a building are examples of mechanical effects.
For our film we don’t really need special effects as it will be inside and not much will be going on. If we was going to use effects we wouldn’t need effects such as blowing up a building or creating psychical wind because if we were going to use then it would change the genre and we don’t want that to happen. I think that it’s best not to use special effects in this type of movie genre, unless it’s necessary.
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