Title: Standard 8 mm film
Content:  Standard 8 mm film, also known as Regular 8 mm film, Double 8 mm film, Double Regular 8 mm film, or simply as Standard-8 or Regular-8, is an 8 mm film format originally developed by the Eastman Kodak company and released onto the market in 1932. 
Title: 8mm (film)
Content:  8mm is a 1999 neo-noir thriller film directed by Joel Schumacher and written by Andrew Kevin Walker. A German–American production, the film stars Nicolas Cage as a private investigator who delves into the world of snuff films. Joaquin Phoenix, James Gandolfini, Peter Stormare, and Anthony Heald appear in supporting roles. The film received negative reviews, but was a box office success. It was followed by a sequel, 8mm 2, in 2005, although the storylines of the two films are not related.
Title: 8 mm film
Content:  Another version of Super-8 film, Single-8, was produced by Fuji in Japan. Introduced in 1965 as an alternative to the Kodak Super 8 format, it had the same final film dimensions, but with a different cassette. Unlike the co-axial design of Super 8, the Single 8 cartridge featured one spool above the other.
Title: 8mm 2
Content:  8mm 2 is a 2005 direct-to-video thriller film directed by J. S. Cardone and starring Johnathon Schaech and Lori Heuring. The film was distributed by Sony Pictures Home Entertainment. When the film was in production, it was titled The Velvet Side of Hell. When Sony picked up the rights to distribute it, it was re-titled 8mm 2. Although this title suggests the film to be a sequel to the 1999 Nicolas Cage film 8mm, the film has no connective elements relating it to the first 8mm film. The film was shot entirely in Budapest.
Title: 8 mm video format
Content:  Not to be confused with 8 mm film. The 8mm video format refers informally to three related videocassette formats for the NTSC and PAL/SECAM television systems. These are the original Video8 (analog recording) format and its improved successor Hi8 (analog video and analog audio but with provision for digital audio), as well as a more recent digital recording format known as Digital8. Their user base consisted mainly of amateur camcorder users, although they also saw important use in the professional television production field. In January 1984, Eastman Kodak announced the new technology. In 1985, Sony of Japan introduced the Handycam, one of the first Video8 cameras with commercial success. Much smaller than the competition's VHS and Betamax video cameras, Video8 became very popular in the consumer camcorder market.
Title: 8 mm film
Content:  The standard 8 mm (also known as regular 8) film format was developed by the Eastman Kodak company during the Great Depression and released to the market in 1932 to create a home movie format that was less expensive than 16 mm. Double 8 spools actually contain a 16 mm film with twice as many perforations along each edge as normal 16 mm film; on its first pass through the camera, the film is exposed only along half of its width. When the first pass is complete, the operator opens the camera and flips and swaps the spools (the design of the spool hole ensures that the operator does this properly) and the same film is subsequently exposed along its other edge, 
Title: Standard 8 mm film
Content:  The format, initially known as Cine Kodak Eight, was developed by Kodak to provide a cheaper and more portable alternative to the 16 mm film format introduced a decade earlier. Standard 8 mm film stock consists of 16 mm film reperforated to have twice the usual number of perforations along its edges, though using the same size sprocket holes. This film is run through the camera, exposing one edge of the film only (the frame size of standard 8 mm film is 4.8 mm x 3.5 mm). The spool is then reversed and the film run through again, exposing the other edge. After processing the film is cut down the centre 
Title: 8 mm film
Content:  edge left unexposed on the first pass. After the film is developed, the processor splits it down the middle, resulting in two lengths of 8 mm film, each with a single row of perforations along one edge. Each frame is half the width and half the height of a 16 mm frame, so there are four times the number of frames in a given film area, which is what makes it cost less. Because of the two passes of the film, the format was sometimes called Double 8. The frame size of regular 8 mm is 4.8 mm × 3.5 mm and 1 meter of film contains 264 pictures. Normally Double 8 is filmed at 16 or 18 frames per second. Common 
Title: 8 mm video format
Content:  Efforts were made to expand Video8 from only the camcorder market into mainstream home video. But as a replacement for full-size VCRs, Video8 failed. It lacks the long (5+ hours) recording times of both VHS and Betamax, offers no clear audio/video improvement, and cost more than equivalent full-size VCRs. Even with all of the advanced features offered in high-end Video8 machines, there was no compelling reason to switch to Video8 for the home application. Initially, many movies were prerecorded in 8mm format for home and rental use, but the rental market for Video8 never materialized. Sony maintained a line of Video8 home VCRs well into the 1990s, but unlike VHS, 8mm VCRs with timers were very expensive. Sony also produced a line of Video8 Walkman-branded players and recorders, with and without a flip-up screen meant for video playback and limited recording. These have been adapted for Digital8 as well as MiniDV formats, even as portable DVD players have become popular in this application. Such players saw use in professional applications, particularly with airlines, who, during the 1980s, adopted 8mm as the format for in-flight movies. They remained in use among some airlines until at least 2015.
Title: Super 8 film
Content:  Super 8 mm film is a motion-picture film format released in 1965  by Eastman Kodak as an improvement over the older "Double" or "Regular" 8 mm home movie format. The film is nominally 8 mm wide, the same as older formatted 8 mm film, but the dimensions of the rectangular perforations along one edge are smaller, which allows for a greater exposed area. The Super 8 standard also allocates the border opposite the perforations for an oxide stripe upon which sound can be magnetically recorded. Unlike Super 35 (which is generally compatible with standard 35 mm equipment), the film stock used for Super 8 is not compatible with standard 8 mm film cameras. There are several varieties of the film system used for shooting, but the final film in each case has the same dimensions. The most popular system by far was the Kodak system.

Question: What genre is 8mm?
Answer: mystery film.