A cryptocurrency is a digital or virtual currency that is secured by cryptography, which makes it nearly impossible to counterfeit or double-spend. Many cryptocurrencies are decentralized networks based on blockchain technology—a distributed ledger enforced by a disparate network of computers. A defining feature of cryptocurrencies is that they are generally not issued by any central authority, rendering them theoretically immune to government interference or manipulation.
A crypto coin is a crypto asset (crypto asset refers to all kinds of cryptos) that has its own blockchain, as opposed to running on another crypto asset’s blockchain. You could also call a crypto coin a cryptocurrency or a “native token” – the underlying idea is that the asset has its own blockchain.
The best known example of a coin in the blockchain space is Bitcoin, the original crypto coin/cryptocurrency. Other examples include Ethereum, Litecoin, and Monero.