> ## Documentation Index
> Fetch the complete documentation index at: https://docs.cosmos.network/llms.txt
> Use this file to discover all available pages before exploring further.

# What is Gaia?

> The Cosmos Hub is a public Proof-of-Stake chain that uses ATOM as its native staking token. It is the first blockchain launched in the Cosmos Network and developed using the cosmos-sdk development framework and ibc-go.

The Cosmos Hub is a public Proof-of-Stake chain that uses ATOM as its native staking token. It is the first blockchain launched in the Cosmos Network and developed using the [cosmos-sdk](/) development framework and [ibc-go](/ibc/next/intro).

Cosmos hub is also the first security aggregation platform that leverages the [interchain-security](https://cosmos.github.io/interchain-security/) protocol ([ICS-28](https://github.com/cosmos/ibc/tree/main/spec/app/ics-028-cross-chain-validation)) to facilitate the launch of cosmos-sdk blockchain projects.

<Tip>
  Interchain security features deployed on the Cosmos Hub blockchain allow anyone to launch a blockchain using a subset, or even the entire validator set of the Cosmos Hub blockchain.
</Tip>

<Info>
  * `gaia` is the name of the Cosmos SDK application for the Cosmos Hub.

  * `gaiad` is the daemon and command-line interface (CLI) that operates the `gaia` blockchain application.
</Info>

For a full list of modules used on the Cosmos Hub follow this [link](/hub/v25/modules/README).

Next, learn how to [install Gaia](/hub/v25/getting-started/installation).