Free and open-source software
Bitcoin Core is an open-source community that develops and launches Bitcoin client software called Bitcoin Core.
It’s a direct descendant of the first Bitcoin software client launched by Satoshi Nakamoto after he published the well-known Bitcoin whitepaper. Since its inception, it is regarded as the most trusted node client for the Bitcoin network.
Bitcoin Core can act as a “full-node” application to completely verify the network or a pruned node where it only store the data from the latest blocks (depends on the user settings). The project still manages similar applications, such as the libsecp256k1 cryptography library and others found in GitHub.
Bitcoin Core is an open-source project and everyone can contribute to the project. Distribution of the software happens via torrents and direct downloads from its website.