Apple Pay is a mobile payment and digital wallet service by Apple Inc. It allows users to make secure and contactless payments using their Apple devices, such as iPhones, Apple Watches, iPads, and Macs. Apple Pay securely stores credit and debit card information, offering a convenient and fast way to make in-store, online, and in-app purchases. The service utilizes near-field communication (NFC) technology for contactless transactions and Touch ID or Face ID for added security.