In case you are able to successfully communicate with people who are deaf and dumb, then you will be able to understand the meaning of silent films. These films do not have any voice to offer. It is only the actions and muted gestures through which the dialogues are transmitted. Before the 1920s, all the movies that were made were in silent mode. Those days, the technology for audio was not developed and hence, movies were made using only gestures.
Silent movies are often made in black and white mainly because such movies were made during the early 1900s. There are still few silent movies made today. There are people who still love watching silent movies which are completely different from the sound and action packed movies that we see of today. But now, these movies have become stale, arch and alien, as most youngsters and adults alike prefer watching movies with sound effects.