What is the metaverse, actually?

There is a concept in tech and innovation – branded by an expensive consultancy company, naturally – known as the Gartner Hype Cycle. Any innovation, be it NFTs (a means of owning ‘unique’ digital art), blockchains (the technology powering crypto-currencies like bitcoin), self-driving cars or wearable tech, will go through distinct (buzzword-heavy) stages before it is adopted by the mainstream.