The metaverse is a concept of a persistent, online, 3D universe that combines multiple different virtual spaces. You can think of it as a future iteration of the internet. The metaverse will allow users to work, meet, game, and socialize together in these 3D spaces.
Blockchain, metaverse-like applications already exist and provide people with liveable incomes. Axie Infinity is one play-to-earn game that many users play to support their income. SecondLive and Decentraland are other examples of successfully mixing the blockchain world and virtual reality apps.