It is the name of a software implementation of the Bitcoin protocol – the protocol for the cryptocurrency 'Bitcoin'. Anyone can make a different node program similar to Bitcoin Core, as long as it follows the protocol (consensus) rules. This is analagous to there being multiple web browsers for the http-protocol.

Some people dont seem to understand this.

submitted by /u/MUFOS
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Source and link to Reddit topic: PSA: "Bitcoin Core" is not a cryptocurrency

Author: Reddit.com