silent cinema
The term 'cine mudo', in Spanish, refers to 'silent cinema' in English. This is a term that comes from the early years of the film industry when films did not have synchronized recorded sound and the dialogues were presented in the form of intertitles. These films instead used live music and a wide variety of visual storytelling techniques to communicate the plot and emotions to the audience.
Silent cinema was the first form of cinema that existed.
This sentence is stating a historical fact about the evolution of cinema, pointing out that the 'silent cinema' or 'cine mudo' in Spanish, was the initial version of this type of entertainment.
Some people consider that silent films were more expressive than sound films.
This is an opinion someone might have about 'cine mudo'. They're comparing it with 'cine sonoro' (Sound Cinema), stating that they found it to be more expressive, likely because actors had to use body language and facial expressions to communicate emotions and the plot, in the absence of spoken dialogue.
Before silent films, the Kinetoscope was the most popular viewing device.
This sentence is about film history and technology. It tells us that before 'cine mudo' or silent cinema became popular, people used other devices to watch films, one of which was the 'Kinétoscope', the name in Spanish for 'Kinetoscope'. The Kinetoscope is an early motion picture display device, not a type of film.