This format is still used by professionals and a very small number of stores may offer them prerecorded. This cassette plays on a standard VHS VCR using an adaptor box, purchased separately. If you have a camcorder in VHS-C format, you may already have the adaptor box. This is film, not videotape. It is considered obsolete but reels of it may be seen once in awhile gathering dust.
Some people still have projectors for it.
Do not buy Super 8 films expecting to convert them to VHS unless you have special equipment for that purpose and that is your business or hobby. Simply aiming a camcorder at a movie screen does not produce good results even with the camcorder on a tripod. These disks are either silver or gold in color. For average subject material the difference is not very noticable. These are 12 inches in size, brown in color, and rarely seen outside of their stiff plastic protective sleeves.