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Ethereum, a decentralized platform that runs smart contracts on a blockchain, was launched in 2015. The concept of Ethereum was introduced to the public by Vitalik Buterin, a Russian-Canadian programmer, in late 2013. After extensive research and development, along with the formation of a core team including co-founders like Gavin Wood and Jeffrey Wilcke, the Ethereum project began its journey.

The official launch date for Ethereum was July 30, 2015. This marked the beginning of the Ethereum network and saw the creation of the first blocks on its blockchain. The genesis block was mined by a group including Vitalik Buterin himself, signaling the start of an ambitious new era in decentralized applications and smart contracts.

Before the launch date, there was a crowdfunded pre-sale event that took place between July 22nd to August 31st, 2014. During this period, individuals could purchase Ethereum's native token, Ether (ETH), with Bitcoin for funding the development of the platform and compensating miners.

Since its launch, Ethereum has evolved significantly, becoming one of the most utilized blockchain networks today, hosting a vast ecosystem of decentralized applications and services ranging from finance to gaming. The network continues to undergo upgrades aimed at improving scalability, security, and sustainability, such as moving from Proof-of-Work (PoW) to Proof-of-Stake (PoS) consensus mechanism through its Ethereum 2.0 upgrade.

Ethereum's impact on the blockchain landscape can hardly be overstated; it set the stage for numerous innovations in decentralized finance (DeFi), non-fungible tokens (NFTs), and more, illustrating the potential of smart contract technology beyond simple transactions.