Square is a popular payment gateway that offers complete point-of-sale systems and payment processing for businesses of all sizes. It allows businesses to accept payments in-person, online, over the phone, and even through installments, and scales with the business's needs. Square also provides automation tools, such as Zapier, to streamline processes and automate workflows across favorite apps. With its user-friendly interface and integrations with thousands of apps, Square helps businesses focus on serving their customers while managing operations.