Tokens are similar to cryptocurrencies in that they are a form of currency that is stored on a blockchain and may be transferred from one account to another. Their behaviour is affected by smart contract implementations. Crypto tokens can represent an investor's stake in the company or they can serve an economic purpose.
Coins are based on blockchains, which means that each blockchain records all transactions involving its own cryptocurrency. All Ether transactions are handled via the Ethereum blockchain. The native token of the Ethereum blockchain is ether. Every transaction is encrypted, and only members of the network may see it.