A P2P network in it’s simplest form is created when two or more devices are connected directly to one and other i.e. without communicating via a central server.
Access rights must be granted on an individual peer level.
Each peer, however, is more independent and can continue operating to some extent if it loses connectivity to the rest of the network.
From a security perspective, P2P networks are also quite robust, as there is no central server that can be maliciously tampered with, allowing any would-be hackers to gain access to the entire system