IFTTT (If This Then That) is a web-based service that allows users to create chains of simple conditional statements, called applets. These applets are triggered based on changes in various web services such as Gmail, Facebook, Instagram, and more. Users can connect different apps and devices to automate tasks and create personalized workflows without the need for any programming knowledge. IFTTT aims to simplify the way people interact with technology by enabling seamless integration between different platforms and services.