Point of sale. They&#x27;re building toward a monopoly on point-of-sale devices in small businesses. A lot of restaurants and locally owned shops have ditched their old registers in favor of Square registers, and Square gets a cut of all their sales. They can expand outward from there, getting into the enterprise market for chains, replacing the ugly, expensive bloatware.<p>Really complex retailers with broad product lines, like supermarkets and big box retailers, will continue with highly customized in-house solutions. But for retailers with only dozens or hundreds rather than thousands of products, and limited budget to buy fancy solutions, it&#x27;s a godsend.<p>And, because the customers are making a major, high-risk, customer-facing commitment, they&#x27;re going to be very sticky, very unlikely to switch. Basically, Square is entering a market where the established players are too slow and coarse-grained to reach a lot of potential customers, and then they&#x27;ll have a terrific barrier to entry. That sounds like a good deal to me, from an investment point of view.