A virtual machine (VM) built on 32-bit architecture and used on the QTUM Network.
x86 in popular usage refers to a 32-bit processor and/or operating system with its attendant limitations in terms of the maximum accessible amount of physical memory. Most modern systems run on 64-bit architecture but x86 systems are still being built to run specialized functions.
Developers on the QTUM (pronounced quantum) network built a customized VM on x86 to run smart contracts in multiple languages. Unlike the Ethereum VM that uses solidity as its programming language, the QTUM x86 VM additionally lets programmers develop smart contracts in C++, Java, Python, among others.