What code does Hedera use?

Could you elaborate on the coding framework utilized by Hedera? As a cryptocurrency enthusiast, I'm particularly interested in understanding the technical backbone that powers this network. I've heard of various blockchain protocols, but I'm keen to know if Hedera adopts a unique approach or builds upon existing frameworks. Specifically, does it utilize a programming language like Solidity or Ethereum's Smart Contracts, or does it have its own proprietary coding system? Additionally, I'm curious about the scalability and security measures implemented in its codebase. Any insights you could provide would be greatly appreciated.