Using visuals to explain anything, allows the explanation to be more inclusive and is more likely to be understood. Visuals should not be used to patronise but should be used to allow a clearer understanding.
Sometimes the understanding of visuals is that they are only for those who do not speak, or cannot read. This is not the case. Visuals are to support understanding. This means it may be appropriate to use more complex words. Visuals are processed faster in most brains than the written or verbal word- which is why so many road signs are visual. This is how we adapt communication to suit all. By having the written word alongside the visual picture.