Promotion is something you do to try and get people interested in buying your product by telling them about it. It's like telling people about a new toy or a special sale in a store so that people will want to come and buy it. Promotion can be done in many different ways, like TV and radio ads, sending out flyers or by posting on social media. You could also give away samples to potential customers or set up a booth at a local event to let people know about your product.