If you dream that you are making or are in an advertisement or commercial, you need to get something out in the open.
You could mean that you feel that your skills or talents aren’t getting enough recognition from other people, or that people don’t understand you.
If you dream that you are watching an advertisement made by someone else, you are worried that someone in your life could be being dishonest with you, pretending to be better at something than they are or trying to get you involved in a project that will end up failing or causing you harm.
The dream is a warning to pay careful attention to what people are telling you and try to distinguish what is real from what you are being told.
What is being advertised in the dream? That could provide some information about the meaning of the dream.