The Hedera Hashgraph platform is a technology which is currently in development, and is designed to be a new form of distributable consensus. Hashgraph refers to a distributed consensus algorithm, and Hedera is the distributed ledger that will implement the Hashgraph technology. It is a distributed ledger platform similar to Ethereum, that can run dApps and support smart contracts.
The Hashgraph technology is based entirely on the blockchain technology and will work together with other projects. However, it is different from other networks/blockchains that are currently operating. Hedera Hashgraph uses a new method of operation that is designed to empower the users and developers to build a brand-new class of distribution for applications, which have not yet been used on any other type of blockchain.