Videodisc (or video disc) is a general term for a laser- or stylus-readable random-access disc that contains both audio and analog video signals recorded in an analog form. Typically, it is a reference to any such media that predates the mainstream popularity of the DVD format.
E & H T Anthony, a camera maker based in New York, marketed in 1898 a combination motion picture camera and projector called "The Spiral" that could capture 200 images arranged in a spiral on an 8 inch diameter glass plate.,When played back at 16 frames per second, it would give a running time of 13 seconds.
Theodore Brown patented in 1907 (UK patent GB190714493) a photographic disk system of recording approximately 1,200 images in a spiral of pictures on a 10 inch disk. Played back at 16 frames per second, the disk could provide around one and a quarter minutes of material. The system was marketed as the Urban Spirograph by Charles Urban, and discs were produced - but it soon disappeared 
P.M.G Toulon, a French inventor working at Westinghouse Electric during the 1950s and 1960s patented a system in 1952 (US Patent 3198880) which used a slow spinning disc with a spiral track of photographically 1.5 millimeter wide recorded frames, along with a flying spot scanner, which swept over them to produce a video image. This was intended to be synchronously combined with playback from a vinyl record. It appears a working system was never produced. It has similarities with the tape based Electronic Video Recording system, which was released for professional use.
Westinghouse Electric Corporation developed a system in 1965 called Phonovid, that allowed for the playback of 400 stored still images, along with 40 minutes of sound. The system used a standard record player, and built the picture up slowly.
The Television Electronic Disc, a mechanical system was rolled out in Germany and Austria in 1970 by Telefunken. 12-inch discs had a capacity of about eight minutes; however, it was abandoned in favor of VHS by its parent company.
Visc was a mechanical video disc system developed in Japan by Matsushita subsidiary National Panasonic. The 12-inch vinyl disc was spun at 500 rpm with each revolution holding three frames of color video, with a total of up to an hour of video on each side of the disc. Discs could be recorded in either a 30-minute-per-side format, or a 60-minute-per-side-format. A later incarnation of the system used 9-inch discs in caddies capable of storing 75 minutes per side The system was abandoned in January 1980 in favor of JVC's VHD system.
The DiscoVision system was released in America in 1978. Developed by MCA and Philips of the Netherlands, it utilized an optical reflective system read by a laser beam. It was renamed several times, as VLP, Laservision, and CD Video. Finally, Japan's Pioneer Electronic Corporation trademarked it as LaserDisc, the name by which it is perhaps best known. The format struggled to gain wide acceptance in the consumer market, and Pioneer became the chief sponsor of the format when MCA, and later Philips, withdrew their support for it. The high cost of both players and discs was the main reason for its ultimate demise.
Thomson CSF created a system that used thin flexible video discs, which used a transmissive laser system, with light source and pickup on opposite sides of the disc. The system was marketed for industrial and educational use in 1980. Each side of the disc could hold 50,000 still CAV frames, and both sides could be read without removing the disc. Thomson exited the videodisc market in 1981.
RCA produced a system called CED under the brand SelectaVision in 1981. The system used a physical pickup riding in grooves of a pressed disc, reading variance in capacitance in the underlying disc. The system competed with Laserdisc for a few years, before being abandoned.
JVC produced a system very similar to CED called Video High Density (VHD). It was launched in 1983 and marketed predominantly in Japan. It was a capacitance contact system but without grooves. VHD discs were adopted in the UK by Thorn EMI which started to develop a consumer catalogue, including bespoke material. Development for the mass market was halted in late 1983 but the system remained on sale for educational and business markets as a computer controlled video system until the late 1980s, with very little success.
DVD (Digital Video Disc, or Digital Versatile Disc) was released in 1996. It is a hybrid of Philips and Sony's MM-CD (Multi-Media Compact Disc) format and Toshiba's SD (Super Density) format. The last-minute adoption of the hybrid DVD format was agreed to by all three companies in an effort to avoid a damaging format war, similar to that between Beta and VHS in the 1970s and 1980s. Toshiba failed to reach a similar compromise agreement with Sony in the race to develop a high-definition optical video disc format in the 2000s. This proved to be a costly mistake for Toshiba (and the format's co-developers, NEC and Microsoft), and the AOD (Advanced Optical Disc) format, later renamed HD DVD, lost a brutal format war with Sony's Blu-ray Disc (BD) format. This format war delayed acceptance of either format, and Blu-ray Disc has only recently gained traction in the consumer market, where it competes with the continued success of DVD and the rise of streaming movie services such as Netflix.
Video discs can be classed based on their playback mechanism:
- Capacitance Based
- Optical discs
- Billboard, 28 April 1979
- Video Age: Television Technology and Applications in the 1980s (Video Bookshelf) (Hardcover)
- Cowie, Jefferson R. Capital Moves: RCA's Seventy-Year Quest for Cheap Labor. Ithaca, N.Y.: Cornell University Press, 1999. ISBN 0-8014-3525-0.
- Daynes, Rob and Beverly Butler. The VideoDisc Book: A Guide and Directory. New York: John Wiley and Sons, 1984. ISBN 0-471-80342-1.
- DeBloois, Michael L., ed. VideoDisc/Microcomputer Courseware Design. Englewood Cliffs, N.J.: Educational Technology Publications, 1982. ISBN 0-87778-183-4.
- Floyd, Steve, and Beth Floyd, eds. The Handbook of Interactive Video. White Plains, NY: Knowledge Industry Publications. 1982. ISBN 0-86729-019-6.
- Graham, Margaret B.W. RCA and the VideoDisc: The Business of Research. (Also as: The Business of Research: RCA and the VideoDisc.) Cambridge: Cambridge University Press, 1986. ISBN 0-521-32282-0, ISBN 0-521-36821-9.
- Haynes, George R. Opening Minds: The Evolution of Videodiscs & Interactive Learning. Dubuque, Iowa: Kendall/Hunt Publishing Co., 1989. ISBN 0-8403-5191-7.
- Isailovi´c, Jordan. VideoDisc and Optical Memory Systems. Englewood Cliffs, N.J.: Prentice-Hall, 1985. ISBN 0-13-942053-3.
- Lardner, James. Fast Forward: Hollywood, the Japanese, and the VCR Wars. (Also as: Fast Forward: Hollywood, the Japanese, and the Onslaught of the VCR.) New York: W. W. Norton & Co Inc., 1987. ISBN 0-393-02389-3.
- Lenk, John D. Complete Guide to Laser/VideoDisc Player Troubleshooting and Repair. Englewood Cliffs, N.J.: Prentice-Hall, 1985. ISBN 0-13-160813-4.
- Schneider, Edward W., and Junius L. Brennion. (1980). The Instructional Media Library: VideoDiscs, (Volume 16). Englewood Cliffs, NJ: Educational Technology Publications. ISBN 0-87778-176-1. 1981.
- Sigel, Efrem, Mark Schubin and Paul F. Merrill. Video Discs: The Technology, the Applications and the Future. White Plains, N.Y. : Knowledge Industry Publications, 1980. ISBN 0-914236-56-3. ISBN 0-442-27784-9.
- Sobel, Robert. RCA. New York: Stein and Day/Publishers, 1986. ISBN 0-8128-3084-9.
- Sonnenfeldt, Richard. Mehr als ein Leben (More than One Life). ?, 2003. ISBN 3-502-18680-4. (In German.)
- Stewart, Scott Alan. Videodiscs in Healthcare: A Guide to the Industry. Alexandria, Virginia: Stewart Publishing, Inc, 1990. ISBN 0-936999-08-X
- The Videodisc Monitor
- Videodisc News
- Videodisc/Optical Disk Magazine
- Video Computing
- Interactive Healthcare Newsletter