Web Serial is a web API that allows web applications to communicate with serial devices directly from the browser. This technology enables developers to create applications that can interact with hardware like Arduino boards, printers, and other serial devices without needing additional software. It provides a way to read from and write to these devices using JavaScript, making it easier to build interactive projects. The Web Serial API is designed to enhance user experience by allowing users to connect their devices seamlessly. Users can select a serial device from their computer, and the web application can then send and receive data in real-time, facilitating various applications in fields like robotics, IoT, and data logging.