Bitcoin is based simply on peer-to-peer transactions. Ethereum however is a whole network, built on the decentralized Blockchain technology, allowing it to be used for purposes other than crypto-trading.
Bitcoin creates an alternate to cash, and can only be used for transactional purposes, but Ether, the BTC equivalent in the Ethereum system, is used not only as a currency, but also used to fuel various contracts and applications built on Ethereum.
Unlike Ripple, which is created to complement financial institutions, the Ethereum system is excellent for usage in businesses and corporations. It can be used to create DApps and Smart Contracts, both of which ensure that the digital information cannot be tampered with and that the information is available to everyone. The Smart Contract also ensures that terms are carried out without error.
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