Personal Learning Environments (PLEs) are a new approach to learning based on Web 2.0 and social software. PLEs recognize that learning takes place across different contexts throughout one's life and aims to provide tools to support lifelong learning. PLEs allow learners to organize their own learning using whatever tools and devices they choose. They also recognize the role of informal learning and have the potential to extend access to educational technology to anyone who wishes to organize their own learning. PLEs present a challenge to traditional education systems by supporting learner-driven and interest-based learning across distributed environments.