EVM is a software environment on the Ethereum blockchain that executes instructions programmed into smart contracts.
Ethereum's main differentiator was the network's ability to support smart contracts. These contracts are written in a new programming language — Solidity — and have instructions that are automatically executed.
This execution is managed by the EVM or Ethereum Virtual Machine environment.
This isolation of the environment provides security and reliability, as it prevents malicious actors from accessing or interfering with smart contracts. The EVM is Turing complete, meaning that it can execute any computationally feasible task, making it flexible and versatile.