Coinbase is a global digital asset exchange company (GDAX), providing a venue to buy and sell digital currencies, as well as send information about those transactions out to the blockchain network in order to verify those transactions.
Read more: Coinbase: What Is It and How Do You Use It? | Investopedia http://www.investopedia.com/tech/coinbase-what-it-and-how-do-you-use-it/#ixzz4x5KXDFWq
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Ethereum is an open-source, public, blockchain-based, distributed, smart contract system. Ether is the name for the token/cryptocurrency that is native to Ethereum’s smart contract platform (just like Bitcoin is the token native to Bitcoin’s blockchain)
A hard fork is a term that describes a major change to blockchain protocol which make previously invalid blocks/transactions valid (or vice-versa). This can be used to keep the same coin with major changes to the blockchain, or to create a new coin.
Bitcoins are electronic currency, otherwise known as 'cryptocurrency'. Bitcoins are a form of digital public money that is created by painstaking mathematical computations and policed by millions of computer users called 'miners'.