Ethereum cryptocurrency is an open source blockchain on a distributed computing platform featuring smart contract. The main functionality of Ethereum blockchain is to enable programming code of any decentralized application.
The ethereum blockchain do not mine bitcoins miners work to earn ether which is a crypto token that fuel the network, therefore Ether is used to pay transaction fees and services on the Ethereum network.
To buy Ethereum cryptocurrency you can join the most trusted platform at Coinbase, you can use credit card and bank transfer. Keep in mind that some of these transactions can take a couple of hours the first time and others may take days; that is normal, do not panic.