Coins are cryptocurrencies that are independent and operate inpedently from any other platform. They are stand-alone
crypto currencies.
Ex: Bitcoin, Litecoin, Ethereum.
Tokens are dependent on other platforms and need other platforms(such as etheruem) to operate.
Ex: Augur, Omisego, golem.
You can see in the below image the list of Tokens and the platform they are dependent on,
(Source: https://coinmarketcap.com/tokens/views/all/)