Comparative advertising is when two or more companies compare their products by showing how they are different and better than each other's products. It is sort of like a competition to show who has the best product. When companies use comparative advertising, they often try to make their product look better than their competitor’s product. They might do this by showing why their product is cheaper, better quality, more reliable, or more up-to-date than their competitor’s. This can be an effective way to convince people to buy their product instead of their competitor’s.