Qtum is a decentralized blockchain platform that combines aspects of both Bitcoin and Ethereum. It was created in 2016 by Patrick Dai, who had previously worked on cryptocurrency projects such as Bitbay and VeChain.

Qtum aims to bridge the gap between Bitcoin and Ethereum by offering a blockchain platform that is scalable, secure, and efficient. It utilizes a modified version of the Bitcoin Core software, combined with an Ethereum Virtual Machine (EVM) for smart contract functionality.

One of the key features of Qtum is its use of the Proof of Stake (PoS) consensus algorithm, which allows users to stake their tokens and earn rewards for securing the network. This is seen as a more energy-efficient alternative to the Proof of Work (PoW) algorithm used by Bitcoin.

Qtum also offers support for Decentralized Applications (dApps) and smart contracts, making it a versatile platform for developers. It has partnerships with several notable companies, including Amazon Web Services and Google Cloud, and has been integrated into a number of blockchain-based projects.

Overall, Qtum offers a unique blend of Bitcoin and Ethereum technologies, providing users with a secure, efficient, and flexible blockchain platform.