Glossary

Peer-to-Peer (P2P)

Plain-language definition Crypto glossary

Key takeaways

Peer-to-peer (P2P) describes a network in which participants connect and transact directly with each other rather than routing everything through a central server or intermediary.
In a P2P network every participant is both client and server; cryptocurrency nodes relay transactions and blocks to one another and maintain the ledger collectively.
Removing the central server removes a single point of failure or control, which makes the network more resilient and harder to censor.

Definition

Peer-to-peer (P2P) describes a network in which participants — “peers” — connect and transact directly with each other, rather than routing everything through a central server or intermediary.

How it works

In a P2P network every participant is both a client and a server, sharing data and workload across the group. Cryptocurrencies are built on this model: nodes relay transactions and blocks to one another, and the ledger is maintained collectively instead of by one company. There is no central point that has to be online — or trusted — for the network to function.

Why it matters

The peer-to-peer design is what lets value move directly between two parties without a bank in the middle, and it removes the single point of failure or control that a central server would create. This makes the network more resilient and harder to censor. “P2P” is also used for direct person-to-person trading, where buyers and sellers deal with each other rather than through an exchange’s order book.

Example

Sending crypto straight from your wallet to someone else’s, with the network relaying it, is a peer-to-peer transaction.

FAQ

Frequently asked questions

How is a peer-to-peer network different from a normal client-server one?

In a client-server model, users connect through a central server that holds the data and does the work. In a P2P network every participant is both a client and a server, sharing data and workload across the group with no single point that must be online or trusted.

Why is P2P important for cryptocurrency?

It lets value move directly between two parties without a bank or other intermediary in the middle. It also removes the single point of failure or control a central server would create, making the network more resilient and harder to censor.

Does "P2P" always mean the network architecture?

Not always. The term also describes direct person-to-person trading, where two people exchange crypto with each other directly. Both senses share the idea of cutting out a central intermediary.