Square provides payment processing and point-of-sale tools that let businesses accept cards in person, online, and on the go. It became widely known for its simple card readers and transparent, per-transaction pricing with no long-term contracts.
Beyond in-person payments, Square offers online checkout, a website and store builder, invoicing, and tools for managing inventory and customers. This makes it a practical all-in-one option for small retailers, restaurants, and service businesses.