Metaverse is a hypothesis that defines the next generation of the Internet. This new generation of the Internet encompasses decentralized and sustainable 3D online environments. This virtual world will be accessible through smartphones, PCs, virtual reality headsets, and other technological gadgets. Nowadays, Metaverse is limited to computer game platforms, but it will cover all aspects of human personal and social life in the near future. Metaverse is being developed today by tech giants. As this new world has many unknown dimensions, studying and researching its effects on human life is necessary. We have to know the future to prepare ourselves better to enter the digital world of the future. This book chapter has been designed to help readers learn more about Metaverse and its related challenges and opportunities.