Marketing involves understanding customer needs and promoting products to meet those needs. The key elements of marketing include public relations, sales promotion, advertising, pricing, distribution, and profit. Public relations differs from advertising in that it involves unpaid media coverage rather than paid placements. Sales promotion provides short-term boosts to sales through discounts or incentives. Advertising communicates product information through various media to attract customers. Pricing must be set efficiently to maximize profits while fitting market realities. Distribution involves how products reach customers through business-to-business or business-to-customer channels like wholesalers or retailers. The overall goal is to generate profit by meeting customer needs.