Let’s say you mention to the audience about the Lincoln Memorial. You show them a photo of it. There is no misunderstanding between you and your audience about the subject because the audience can see and touch the Memorial. They know exactly what you are talking about.
On another slide, you talk to them about the importance of being “wealthy”. Every single member of your audience will have a different idea of what “wealth” means. To one person, having $10,000 in the bank makes him feel wealthy because he has never had that much money before. To another person, $10,000 means nothing to him. He does not feel “wealthy” because he comes from a family with millions of dollars.
The first example represents “high quality”. The second example is “low quality”. If you want your audience to see things your way, you should try to present high quality information as much as possible.