  The advances in Artificial Intelligence (AI) have led to technological
advancements in a plethora of domains. Healthcare, education, and smart city
services are now enriched with AI capabilities. These technological
advancements would not have been realized without the assistance of fast,
secure, and fault-tolerant communication media. Traditional processing,
communication and storage technologies cannot maintain high levels of
scalability and user experience for immersive services. The metaverse is an
immersive three-dimensional (3D) virtual world that integrates fantasy and
reality into a virtual environment using advanced virtual reality (VR) and
augmented reality (AR) devices. Such an environment is still being developed
and requires extensive research in order for it to be realized to its highest
attainable levels. In this article, we discuss some of the key issues required
in order to attain realization of metaverse services. We propose a framework
that integrates digital twin (DT) with other advanced technologies such as the
sixth generation (6G) communication network, blockchain, and AI, to maintain
continuous end-to-end metaverse services. This article also outlines
requirements for an integrated, DT-enabled metaverse framework and provides a
look ahead into the evolving topic.
