Table 1.

Four types of the metaverse

	Augmented reality	Lifelogging	Mirror world	Virtual reality
Definition	Building a smart environment by utilizing location-based technologies and networks.	Technology to capture, store, and share everyday experiences and information about objects and people.	It reflects the real world as it is, but integrates and provides external environment information.	A virtual world built with digital data
Features	Building a smart environment using location-based technology and networks	Recording information about objects and people using augmented technology	Virtual maps and modeling using GPS technology	Based on interaction activities between avatars that reflect the user’s ego
Applications	Smartphones, vehicle HUDs	Wearable devices, black boxes	Map-based services	Online multiplayer games
Use cases	Pokemon Go, Digital Textbook, Realistic Content	Facebook, Instagram, Apple Watch, Samsung Health, Nike Plus	Google Earth, Google Maps, Naver Maps, Airbnb	Second Life, Minecraft, Roblox, Zepeto

From Lee S. Log in Metaverse: revolution of human×space×time (IS-115) [Internet]. Seongnam: Software Policy & Research Institute; 2021 [cited 2021 Nov 29]. Available from: https://spri.kr/posts/view/23165?code=issue_reports [3]; Smart J, Cascio J, Paffendorf J. Metaverse roadmap: pathway to the 3D web [Internet]. Ann Arbor (MI): Acceleration Studies Foundation; 2007 [cited 2021 Nov 29]. Available from: https://metaverseroadmap.org/MetaverseRoadmapOverview.pdf [4].