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7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">Core Concepts</span><meta itemprop="position" content="1"></li></ul></nav><div class="theme-doc-markdown markdown"><header><h1>Core Concepts</h1></header><p>Build your foundational understanding of what makes the Stellar network tick.</p> <section class="row"><article class="col col--6 margin-bottom--lg"><a class="card padding--lg cardContainer_fWXF" href="/docs/learn/fundamentals/stellar-stack"><h2 class="text--truncate cardTitle_rnsV" title="Stellar Stack">📄️<!-- --> <!-- -->Stellar Stack</h2><p class="text--truncate cardDescription_PWke" title="The Stellar stack is made up of the following components: the networks (Mainnet, Testnet, and Futurenet), Stellar Core, Horizon API, RPC, and SDKs, each of which plays a specific part in providing financial infrastructure that is resilient to failures, available to anyone, and fast and cheap enough to serve real-world use cases.">The Stellar stack is made up of the following components: the networks (Mainnet, Testnet, and Futurenet), Stellar Core, Horizon API, RPC, and SDKs, each of which plays a specific part in providing financial infrastructure that is resilient to failures, available to anyone, and fast and cheap enough to serve real-world use cases.</p></a></article><article class="col col--6 margin-bottom--lg"><a class="card padding--lg cardContainer_fWXF" href="/docs/learn/fundamentals/networks"><h2 class="text--truncate cardTitle_rnsV" title="Networks">📄️<!-- --> <!-- -->Networks</h2><p class="text--truncate cardDescription_PWke" title="Stellar has three networks: the public network (Mainnet, also called Pubnet or the Public Network), the test network (Testnet), and a dev network (Futurenet). Mainnet is the main network used by applications in production. It connects to real financial rails and requires XLM to cover minimum balances, transaction fees, and rent. The Testnet is a smaller, free-to-use network maintained by SDF that functions like the Mainnet but doesn’t connect to real money. It has a built-in testnet XLM faucet (called Friendbot), and it resets on a regular cadence, so it's the best place for developers to test applications when they need a stable environment that mirrors Mainnet functionality. Futurenet is a dev network you can use to test more bleeding edge features that also has access to its own Friendbot. It resets whenever a reset is necessary, so it's not as predictable as Testnet, but it is where new features may be introduced before the are implemented in stable releases.">Stellar has three networks: the public network (Mainnet, also called Pubnet or the Public Network), the test network (Testnet), and a dev network (Futurenet). Mainnet is the main network used by applications in production. It connects to real financial rails and requires XLM to cover minimum balances, transaction fees, and rent. The Testnet is a smaller, free-to-use network maintained by SDF that functions like the Mainnet but doesn’t connect to real money. It has a built-in testnet XLM faucet (called Friendbot), and it resets on a regular cadence, so it's the best place for developers to test applications when they need a stable environment that mirrors Mainnet functionality. Futurenet is a dev network you can use to test more bleeding edge features that also has access to its own Friendbot. It resets whenever a reset is necessary, so it's not as predictable as Testnet, but it is where new features may be introduced before the are implemented in stable releases.</p></a></article><article class="col col--6 margin-bottom--lg"><a class="card padding--lg cardContainer_fWXF" href="/docs/learn/fundamentals/lumens"><h2 class="text--truncate cardTitle_rnsV" title="Lumens (XLM)">📄️<!-- --> <!-- -->Lumens (XLM)</h2><p class="text--truncate cardDescription_PWke" title="Lumens (XLM) are the native currency of the Stellar network. The lumen is the only token that doesn’t require an issuer or trustline. They are used to pay all transaction fees, fund rent, and to cover minimum balance requirements on the network.">Lumens (XLM) are the native currency of the Stellar network. The lumen is the only token that doesn’t require an issuer or trustline. They are used to pay all transaction fees, fund rent, and to cover minimum balance requirements on the network.</p></a></article><article class="col col--6 margin-bottom--lg"><a class="card padding--lg cardContainer_fWXF" href="/docs/learn/fundamentals/stellar-consensus-protocol"><h2 class="text--truncate cardTitle_rnsV" title="Stellar Consensus Protocol (SCP)">📄️<!-- --> <!-- -->Stellar Consensus Protocol (SCP)</h2><p class="text--truncate cardDescription_PWke" title="Consensus is hugely important in a decentralized payment system. It distributes the monitoring and approval of transactions across many individual nodes (computers) instead of relying on one closed, central system. Nodes are run by organizations or individuals, and the goal is for all nodes to update the ledger in the same way, ensuring each ledger reaches the same state. Consensus is vital for the security of the blockchain, allowing nodes to agree on something safely and preventing double-spend attacks.">Consensus is hugely important in a decentralized payment system. It distributes the monitoring and approval of transactions across many individual nodes (computers) instead of relying on one closed, central system. Nodes are run by organizations or individuals, and the goal is for all nodes to update the ledger in the same way, ensuring each ledger reaches the same state. Consensus is vital for the security of the blockchain, allowing nodes to agree on something safely and preventing double-spend attacks.</p></a></article><article class="col col--6 margin-bottom--lg"><a class="card padding--lg cardContainer_fWXF" href="/docs/learn/fundamentals/stellar-data-structures"><h2 class="text--truncate cardTitle_rnsV" title="Stellar Data Structures">🗃️<!-- --> <!-- -->Stellar Data Structures</h2><p class="text--truncate cardDescription_PWke" title="4 items">4 items</p></a></article><article class="col col--6 margin-bottom--lg"><a class="card padding--lg cardContainer_fWXF" href="/docs/learn/fundamentals/transactions"><h2 class="text--truncate cardTitle_rnsV" title="Operations & Transactions">🗃️<!-- --> <!-- -->Operations & Transactions</h2><p class="text--truncate cardDescription_PWke" title="3 items">3 items</p></a></article><article class="col col--6 margin-bottom--lg"><a class="card padding--lg cardContainer_fWXF" href="/docs/learn/fundamentals/fees-resource-limits-metering"><h2 class="text--truncate cardTitle_rnsV" title="Fees, Resource Limits, and Metering">📄️<!-- --> <!-- -->Fees, Resource Limits, and Metering</h2><p class="text--truncate cardDescription_PWke" title="Fees overview">Fees overview</p></a></article><article class="col col--6 margin-bottom--lg"><a class="card padding--lg cardContainer_fWXF" href="/docs/learn/fundamentals/stellar-ecosystem-proposals"><h2 class="text--truncate cardTitle_rnsV" title="Stellar Ecosystem Proposals (SEPs)">📄️<!-- --> <!-- -->Stellar Ecosystem Proposals (SEPs)</h2><p class="text--truncate cardDescription_PWke" title="Each SEP is a distinct blueprint meant to help users build a product or service that interoperates with other products and services on the Stellar network.">Each SEP is a distinct blueprint meant to help users build a product or service that interoperates with other products and services on the Stellar network.</p></a></article><article class="col col--6 margin-bottom--lg"><a class="card padding--lg cardContainer_fWXF" href="/docs/learn/fundamentals/anchors"><h2 class="text--truncate cardTitle_rnsV" title="Anchors">📄️<!-- --> <!-- -->Anchors</h2><p class="text--truncate cardDescription_PWke" title="An anchor is a Stellar-specific term for the on and off-ramps that connect the Stellar network to traditional financial rails, such as financial institutions or fintech companies. Anchors accept deposits of fiat currencies (such as the US dollar, Argentine peso, or Nigerian naira) via existing rails (such as bank deposits or cash-in points), then sends the user the equivalent digital tokens on the Stellar network. The equivalent digital tokens can either represent that same fiat currency or another digital token altogether. Alternatively, anchors allow token holders to redeem their tokens for the real-world assets they represent.">An anchor is a Stellar-specific term for the on and off-ramps that connect the Stellar network to traditional financial rails, such as financial institutions or fintech companies. Anchors accept deposits of fiat currencies (such as the US dollar, Argentine peso, or Nigerian naira) via existing rails (such as bank deposits or cash-in points), then sends the user the equivalent digital tokens on the Stellar network. The equivalent digital tokens can either represent that same fiat currency or another digital token altogether. Alternatively, anchors allow token holders to redeem their tokens for the real-world assets they represent.</p></a></article></section></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="row margin-top--sm theme-doc-footer-edit-meta-row"><div class="col"><a href="https://github.com/stellar/stellar-docs/tree/main/docs/learn/fundamentals/README.mdx" target="_blank" rel="noopener noreferrer" class="theme-edit-this-page"><svg fill="currentColor" height="20" width="20" viewBox="0 0 40 40" class="iconEdit_Z9Sw" aria-hidden="true"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"></path></g></svg>Edit this page</a></div><div class="col lastUpdated_JAkA"><span class="theme-last-updated">Last updated<!-- --> on <b><time datetime="2024-06-12T19:30:58.000Z" itemprop="dateModified">Jun 12, 2024</time></b> by <b>Bri Wylde</b></span></div></div></footer></article><nav 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