Coin
A coin is a cryptocurrency that runs on its own blockchain, while a token is built on top of another blockchain.
Quick Reference:
Has its own blockchain Coins = Money Bitcoin and Ethereum.
Expanded Explanation:
Coins like Bitcoin or Ethereum run on their own independant blockchains. They are usually used as money, stores of value or as fuel for their network. Tokens on the other hand, are created on existing blockchains like ethereum, often serving as utility or exclusive access.