What does metaphor persuasive technique mean

Persuasive techniques refer to the various techniques which are utilised in order to persuade the viewer to support the writer's opinion or to influence then to feel a certain way.

A metaphor is a figure of speech which is applied to an object or action to indicate a sense of similarity or likeness between them, although it isn't literally applicable.

It can be used as a persuasive technique as it can influence the viewer's emotions. As well as this, it can produce a powerful and memorable idea or image for the viewer, thus enabling it to be an effect communicator of both tangible and conceptual information.