Why is advertising an important tool in marketing? Advertising is an important tool in marketing because: Promotion of Products and Services It might be anything from marketing a forthcoming entertainment event to selling a new product line, organizing a political campaign, expanding an existing platform of services, or putting up a banner for your first business. Increasing Customer Awareness Advertising helps to raise your target demographic's awareness of issues with which they may be unfamiliar as well as educate them on the related benefits of your product or service. Comparisons with Competitors Advertising encourages your target audience to compare and contrast your product or service to that of your competitors. Retention of Existing Customers This also attracts new clients who may not have needed your products or services when you originally launched but are now glad their memories have been sparked.