This chapter introduces Metaverse and then focuses on SL and Japan’s island located there. Metaverse provides a fully immersive and interconnected virtual world where individuals can work, live, etc. and interact in a digital environment that closely resembles the real world. On the other hand, SL is a three-dimensional world where avatars perform certain tasks on behalf of us. Details about Metaverse and Second Life are provided. Also, Japan’s island in SL is described in terms of the virtual classrooms and teaching/learning opportunities that it provides. The country’s island is owned by Nagaoka University of Technology and researchers there built virtual buildings containing virtual classrooms for various projects and activities (which will be discussed in Chap. 4 ). The classrooms include red chairs, tables, a podium, whiteboards, a recording box to record chat dialogues, and microphones for those using the speech function to communicate. This arrangement gives the participants a sense of reality because the virtual classrooms resemble those seen in real life. Students use avatars in the virtual environment to carry out activities on behalf of them. Their avatars construct items such as houses by preparing prims (three dimensional objects like cubes) in a space referred to as a sandbox, located in front of the virtual classroom.