Ethereum was launched in 2015 as a decentralized software platform that can run smart contracts and decentralized applications (dApps) without any intermediaries or censorship. Ethereum has its own native cryptocurrency called ether (ETH), which is used to pay for the execution of these programs on the network. Ethereum also has a flexible supply of ether that can be adjusted by the community through consensus. Ethereum transactions are also recorded in a blockchain, but unlike Bitcoin, Ethereum’s blockchain can store more complex data such as code and state information1.

Some of the main differences between Ethereum and Bitcoin are:

1. Bitcoin is primarily designed as an alternative to traditional currencies and hence a medium of exchange and a store of value, while Ethereum is intended for complex smart contracts and decentralized applications that can enable various use cases such as finance, gaming, identity, etc.

1. Bitcoin has a fixed supply of 21 million coins that will be reached around 2140, while Ethereum has no hard cap on its supply and can be adjusted by the community.
1. Bitcoin uses a proof-of-work (PoW) consensus mechanism that requires miners to compete for rewards by solving cryptographic puzzles, while Ethereum is transitioning to a proof-of-stake (PoS) consensus mechanism that requires validators to stake their ether to secure the network and earn rewards.
1. Bitcoin transactions are relatively slow and expensive compared to Ethereum transactions, which are faster and cheaper due to higher scalability and lower fees.
1. Bitcoin has a simpler programming language called Script that limits its functionality and flexibility, while Ethereum has a Turing-complete programming language called Solidity that allows for more complex and versatile applications.

In summary, Ethereum and Bitcoin are both innovative and influential projects in the cryptocurrency space, but they have different goals and features that make them suitable for different use cases and investors.
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