The document discusses the potential advantages and challenges of using 3D virtual worlds for language learning. It outlines key features of 3D virtual worlds like realistic immersion through avatars and multimedia input. Potential benefits include opportunities for negotiation of meaning through interaction, engagement through artifact creation, and a sense of presence. However, challenges include the need for learner and teacher training on the technology, technical requirements, and long-term financial costs of creating and maintaining virtual worlds. Research also found that effective use requires training and that techno-stress or sociocultural concerns can negatively influence learning.