Ethereum and Bitcoin are blockchain-based decentralized entities. They are the two largest cryptocurrencies by market capitalization at the moment.
Bitcoin is nothing more than an alternative to the currency that is printed by banks. Ethereum is an entire platform that companies can use to:
- create new cryptocurrencies (called ERC-20 tokens)
- build and run new decentralized programs
Ethereum transactions are confirmed faster than on Bitcoin network. The maximum quantity of Ethereum potentially available is not limited as Bitcoin (21 million).
In the Ethereum network there are no transaction fees to execute operations, but a gas system. Every single transaction requires some amount of gas.