This document discusses professional learning communities (PLCs) and personal learning networks (PLNs). It states that PLCs are groups that people belong to for their work, while PLNs are groups people belong to for lifelong learning. PLNs are made up of individuals' connections and contacts around the world that they use to collaboratively share and exchange knowledge. Members of PLCs bring their PLNs with them, and learning teams within PLCs benefit from networking through PLNs. Together, PLNs and learning teams make up the foundation of effective PLCs by promoting sharing of collective knowledge.