The metaverse refers to an immersive virtual world (accessible by wearing a headset) that simulates real-life events, where people can interact regardless of the distance separating them. The metaverse concept has been around for decades but only started trending recently with the advent of augmented reality, oculus headsets, and virtual games.
Example
An example of the metaverse is the Decentraland, where people can buy virtual lands, houses, and many other virtual properties.