Although both Bitcoin and Ethereum utilize a blockchain to validate transactions, there exist several key differences:
* Bitcoin was designed as primarily a currency or store of value, while Ethereum is more focused on enabling smart contracts.
* Whereas new Bitcoins are awarded to miners for validating blocks of transactions (and thus incentivizing them), Ethereum's algorithm instead rewards those who contribute their computing power to the network through what are called 'gas fees.'  This ensures that no one party can control a large percentage of the network which would potentially allow them to manipulate transaction times/confirmations.
* Since Ethereum is focused on smart contract functionality, Ethereum has greater programmatic capability than Bitcoin as it features an internal Turing complete scripting language allowing developers to write highly complex programs on top of the protocol.
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