Appen Ltd. engages in the development of human-annotated datasets for machine learning and artificial intelligence. It operates through the Global Services and New Markets segments. The Global Services segment includes the services provided to the five major U.S. technology customers using data annotation platforms and tools. The New Markets segment represents product-led businesses using collection, annotation, and evaluation products and tools, and Enterprise, Government, China, and Quadrant businesses. The company was founded in 1996 and is headquartered in Chatswood, Australia.