because it moves in a slow motion and it projects images
that was the jazz singer in 1927
Warner Brothers Studios, with a process they called "Vitaphone". It was quickly improved upon, and tehn other patented "sound with film" processes emerged, and "talkies" became the norm within 18...
The first motion picture shown to more than one paying customer was in 1896. Source: see Related link below.
lumiere brothers