Final answer:
The four basic types of promotion are personal selling, mass selling, sales promotion, and publicity, each contributing to a company's promotional efforts in different ways.
Step-by-step explanation:
The basic types of promotion include personal selling, mass selling, sales promotion, and publicity. Each of these plays a unique role within a company's overall promotional strategy. Personal selling involves direct interaction between a sales representative and a customer, aimed at making a sale and forming a relationship. Mass selling encompasses advertising and publicity efforts that reach a large audience through media such as television, radio, and online platforms. Sales promotion refers to short-term incentives to encourage purchasing or sales of a product or service. Lastly, publicity involves non-paid promotional activities, often in the form of news articles or events that create attention for the product or brand.