Turing Completeness
Turing completeness refers to the ability of a system to perform any computation that a universal computer can execute, provided it has sufficient time and memory. The EVM is designed to be Turing-complete, allowing developers to write complex logic for financial derivatives, lending, and automated market makers.
Unlike simple payment scripts, Turing-complete smart contracts can handle conditional logic, loops, and recursive function calls. This flexibility is what enables the creation of decentralized finance, as it allows for the implementation of arbitrary financial agreements.
However, this power necessitates strict resource management through gas to ensure the network does not hang due to poorly written or malicious code.