Sometimes referred to as a token, or a coin. The two terms are used pretty interchangeably.
Essentially, it is a digital code that defines a unit of account on a Blockchain is the technology that underlies cryptocurrency. Not just Bitcoin, but all of them. Blockchain is a kind of ... Click for full definition. This digital signature can be owned, bought and sold… thereby giving it a market value. At the core, however, the “coin” is really just a digital unit of account.