A PWA (Progressive Web App) is a type of mobile application that runs on a web browser and offers a native app-like experience. PWA apps are designed to be fast, reliable, and responsive, and they can be accessed from any device with a web browser, without the need for installation or updates. PWA apps can work offline, send push notifications, and access device hardware, making them a popular choice for businesses looking to provide their users with a seamless mobile experience.