Coins are basically cryptocurrencies operating on their respective blockchains, completely independent of any other coins. The coin is mainly used to distinguish itself from the tokens that operate on top of their respective blockchain. Ethereum (ETH) is the most prominent example, which is a coin and blockchain at the same time.

There are also platforms including Ethereum and EOS, that allow users to create tokens including cryptocurrencies whose operations solely rely upon the parent blockchain. In other words, if the platform ever goes down, it’s coin will cease to exist.