And these sales aren’t just to customers. You see, in order to join an MLM you usually need to buy products to sell (often referred to as a starter kit, or similar). And then in order to remain a seller, stylist, supervisor, or whatever term the company uses, you often need to make a minimum number of sales in a given time period (though not always).
Multi-level marketing is a strategy some direct-sales companies use to encourage their existing distributors to recruit new distributors by paying the existing distributors a percentage of their recruits' sales. The recruits are the distributor's "downline." All distributors also make money through direct sales of products to customers. Amway is an example of a well-known direct-sales company that uses multi-level marketing.