The Bitcoin Core project provides software that helps you use Bitcoin. Its flagship program is a full node that finds the valid chain of blocks with the most Proof-of-Work (PoW). The users of Bitcoin Core only accept transactions on that chain, making it the Bitcoin block chain that everyone else wants to use.

It is these users who keep Bitcoin decentralized. They individually run their own Bitcoin Core full nodes, and each of those full nodes separately follows the exact same rules to decide which block chain is valid.

There's no voting or other corruptible process involved: there's just individual software following identical rules to evaluate identical blocks and coming to identical conclusions about which block chain is valid.

This shared agreement (called consensus) allows people like you to only accept valid bitcoins, enforcing Bitcoin's rules without any dependency on centralized authorities.

In addition to improving Bitcoin's decentralization, Bitcoin Core users get better security for their bitcoins, privacy features not available in other wallets, a choice of user interfaces, and several other powerful features.

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