Bitcoin was the first to introduce blockchain technology and prove that we could transfer ownership without the need for a trusted third party.
Ethereum was the second major iteration, adding a scripting language with smart contracts to the blockchain. But neither Bitcoin nor Ethereum has come anywhere close to the performance needed for using blockchain at scale in real-world settings.
MultiversX has rebuilt everything from scratch to bring a 1000x improvement in throughput, execution speed, and transaction cost.
Think of it like the transition the internet went through when switching from dial-up to broadband.