Pyramid selling, also known as multi-level marketing, is a business model in which individuals earn money not only through their own sales, but also through the sales of those they recruit into the company. This creates a pyramid-like structure, with those at the top earning the most and those at the bottom earning the least. While it may seem like a lucrative opportunity, pyramid selling has been criticized for its emphasis on recruitment rather than product sales, leading to potential financial losses for those at the bottom of the pyramid.