Hedera Hashgraph is a public network based on distributed ledger technology (DLT), developed for businesses and companies as a platform for decentralized services and applications. Hedera positions itself as a third–generation public network, the next stage in the development of bitcoin and Ethereum. The strengths of the project include high scalability, security, smart contracts, energy efficiency and low usage fees.

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In this blog post, Sam Klemens from Exodus, the desktop and mobile wallet that can create HBAR accounts, covers what is Hedera Hashgraph, Hashgraph vs Blockchain, HBAR, Hedera Staking, and more: 
https://www.exodus.io/blog/what-is-hedera-hashgraph-hbar/