Crypto tokens represent a particular interchangeable and tradable asset or a utility that is often found on blockchain.
Cryptocurrencies, altcoins [link do What are altcoins?]and tokens are often used as synonyms. In fact, they are all different terms. Altcoins and tokens are two subsets of cryptocurrencies. Tokens differ from altcoins as they operate on a top of a blockchain making it easier to create decentralized applications. About 80% of existing coins are tokens because they are much easier to create.
For example, Ethereum supports the development of additional cryptocurrency tokens, and projects such as Tron and EOS began as Ethereum-based tokens.