The acting role that has little or no dialogue, and is reserved for highly recognizable actors or personalities, are known as walk-ons.
This refers to the process of roleplaying on a screen with other actors or cast for the production of a movie, with clearly defined roles
Hence, we can see that when a popular actor or personality is invited to make a cameo appearance in a movie without saying a word or making very little dialogue, this is known as walk-ons.
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