According to Wikipedia this would be the definition of bitcoin:
The bitcoin (sign:; abr .: BTC, XBT) is a cryptocurrency conceived in 2009. The term also applies to the protocol and the P2P network that supports it, and is commonly referred to as a digital currency. uses Bitcoin to refer to the network or to the protocol and bitcoin (in Spanish bitcoin, plural bitcoines) to refer to the monetary units.
Since the beginning the most common abbreviation to represent a bitcoin has been BTC. However, the use of XBT, which better adapts to international currency standards that do not belong to a specific country (ISO 4217), is becoming increasingly widespread. The initial X indicates that it is a currency that is not legal tender in any country such as gold (XAU) and silver (XAG).
To represent bitcoins you can also use the symbol), which was used by Satoshi Nakamoto in the early versions of Bitcoin. This symbol has been incorporated into the Unicode standard (U + 20BF).
Bitcoin is characterized by being decentralized, that is, it is not backed by any government nor does it depend on trust in a central issuer. On the contrary, it uses a work test system to prevent double spending and reach consensus among all the nodes that make up the network, exchanging information about an unreliable and potentially compromised network (resolves the problem of Byzantine generals). Similarly, transactions do not need intermediaries and the protocol is open source.
Bitcoin is an innovative project in constant evolution and change. While developers recommend investigating how they work before investing in them or opening a portfolio to use them, they also consider that they have the ability to change the world in economic terms.