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

# The OP Stack

> The standard framework for building Ethereum Layer 2 Rollups.

The OP Stack is the standardized, shared, and open-source development stack that powers Optimism and makes it easy to spin up your own production-ready Layer 2 blockchain.
Whether you're building applications or deploying your own chain, the OP Stack provides the foundation you need.

## What is the OP Stack?

The OP Stack is a modular collection of software components that work together to create Layer 2 blockchains. It includes:

* **Execution Layer**: Processes transactions and manages state
* **Consensus Layer**: Handles block production and validation
* **Data Availability**: Ensures transaction data is available
* **Settlement Layer**: Finalizes transactions on Ethereum

## Choose Your Path

<CardGroup cols={2}>
  <Card title="Build Applications" icon="code" href="/app-developers/quickstarts/starter-kit">
    Start building decentralized applications on existing OP Stack chains
  </Card>

  <Card title="Deploy a Chain" icon="server" href="/operators/chain-operators">
    Launch your own OP Stack chain for your project or organization
  </Card>

  <Card title="Run a Node" icon="computer" href="/operators/node-operators">
    Operate infrastructure by running your own OP Stack node
  </Card>

  <Card title="Contribute to Protocol" icon="github" href="https://github.com/ethereum-optimism/optimism/blob/develop/CONTRIBUTING.md">
    Help build the future of the OP Stack protocol
  </Card>
</CardGroup>

## Development Options

<Tabs>
  <Tab title="Mainnet">
    Build on **OP Mainnet** for production applications with real users and value.

    * Network: Production-ready Layer 2
    * Security: Secured by Ethereum mainnet
    * Ecosystem: Full ecosystem of tools and services
  </Tab>

  <Tab title="Testnet">
    Use **OP Sepolia** for testing and development without real costs.

    * Network: Test environment
    * Faucets: Free test ETH available
    * Perfect for: Development and testing
  </Tab>

  <Tab title="Local Development">
    Run your own local OP Stack chain for rapid development and testing.

    * Tools: Supersim, Anvil, Hardhat
    * Speed: Instant transactions
    * Control: Full control over chain behavior
  </Tab>
</Tabs>

## Quick Start Guide

<Steps>
  <Step title="Set Up Your Environment">
    Install Node.js, your preferred IDE, and essential development tools
  </Step>

  <Step title="Choose Your Framework">
    Select from popular frameworks like Hardhat, Foundry, or Remix
  </Step>

  <Step title="Get Test Funds">
    Use the [Superchain Faucet](https://console.optimism.io/faucet) to get test ETH
  </Step>

  <Step title="Deploy Your First Contract">
    Deploy a simple smart contract to get familiar with the process
  </Step>

  <Step title="Explore Advanced Features">
    Learn about cross-chain messaging, account abstraction, and more
  </Step>
</Steps>

## Key Features

* **EVM Compatibility**: Full compatibility with Ethereum tooling and smart contracts
* **Low Fees**: Significantly lower transaction costs than Ethereum mainnet
* **Fast Finality**: Near-instant transaction confirmation
* **Ethereum Security**: Inherits security from Ethereum's consensus
* **Modular Design**: Customizable components for specific needs

## Next Steps

<CardGroup cols={3}>
  <Card title="Architecture Overview" icon="stars" href="/op-stack/protocol/components">
    Understand the technical architecture of the OP Stack
  </Card>

  <Card title="Development Tools" icon="wrench" href="/app-developers/tools">
    Discover tools and services for building on OP Stack
  </Card>

  <Card title="Tutorials" icon="book" href="/app-developers/tutorials">
    Follow step-by-step tutorials for common use cases
  </Card>
</CardGroup>

<Info>
  The OP Stack is continuously evolving. Check the [OP Stack specifications](https://specs.optimism.io) to stay current with new features and improvements.
</Info>