TheMetaverse marks a new stage in digital evolution, merging virtual, augmented,and mixed realities with artificial intelligence, blockchain, and cloudcomputing. This volume explores its technological, legal, and ethicaldimensions, examining how this immersive ecosystem reshapes social interaction,work, education, and commerce.The first section focuses on theoretical andmethodological issues, addressing regulation, privacy, taxation, and labortransformations, while introducing frameworks such as the LETO methodology fordeveloping responsible Metaverse applications. The second section highlightspractical applications in fields like finance, maritime law, cultural heritage,and tourism.The contributions reveal both the opportunitiesand the challenges of this emerging digital frontier, calling for new legal andethical paradigms to ensure innovation aligns with human rights and socialinclusion.