QTUM is a blockchain platform that combines Bitcoin and Ethereum elements to provide a secure and decentralized environment for building and running smart contracts and dapps. Its hybrid consensus mechanism combines proof-of-work (PoW) and proof-of-stake (PoS) to achieve security and scalability. The platform uses familiar programming languages such as Solidity and C++ to make it easier for developers to build and deploy smart contracts and dapps. QTUM was created by a team led by Patrick Dai and is primarily used for building and running smart contracts and dapps, with the QTUM token used for payments, incentivizing network participants, and governance decisions.