Here is a more detailed explanation:
Nostr is a protocol, not an app. This means that it is a set of rules that anyone can follow to build a social networking app.
Nostr is decentralized. This means that there is no central server that controls the network. Messages are sent and received through a network of relays, which are run by volunteers.
Nostr is censorship-resistant. This means that it is difficult for governments or other organizations to censor messages that are sent over the Nostr network.
Nostr is open source. This means that the code is freely available for anyone to inspect and modify.
