Bitcoin Core is open-source software that is the core implementation of the Bitcoin protocol. Developed by the Bitcoin developer community, this software serves as the primary “client” or “node” in the Bitcoin network.
Bitcoin Core is Bitcoin software actively used today and is represented by the symbol BTC, created by Satoshi Nakamoto and formerly known as Satoshi Client and Bitcoin-Qt.
Bitcoin miners worldwide use and develop The Bitcoin Core software, thus creating the Bitcoin network.
Bitcoin Core functions to verify transactions, create private and public keys, and create blocks that can process around 1,800 transactions every 10 minutes. Bitcoin Core is programmed to decide which blockchain contains valid transactions.
Bitcoin Core users only accept transactions for that blockchain, making it the blockchain everyone wants to use.