Advertising is a permanent strategy that involves marketing and sales, whereas sales promotions have a limited time frame. Different end goals. Advertising appeals to the wants and needs of a target audience, and seeks to persuade prospective customers that your company is worthy of their attention.
Advertising is any paid form of non-personal presentation and promotion of ideas, goods, or services by an identified sponsor. Sales promotions on the other hand are short-term incentives to encourage the purchase or sale of a product or service.