feat: what is a node

docs.json

@@ -68,6 +68,7 @@
   "navigation": {
     "pages": [
       "start-here",
+      "what-is-a-node",
       "first-smart-contract",
       "get-support",
       "from-ethereum",

what-is-a-node.mdx

@@ -0,0 +1,52 @@
+---
+title: "What is a node?"
+description: "Overview of TON nodes, validator roles, and how apps connect to the network."
+---
+
+import { Image } from "/snippets/image.jsx";
+
+A node is a server running TON blockchain software. It stores the chain state, verifies blocks and transactions, and propagates new data to other nodes and clients.
+
+This matters when deciding whether to rely on a public API or run infrastructure, and when tracing how a wallet action becomes an on-chain transaction.
+
+## What a node does
+
+A _full node_ keeps the latest blockchain state and relays blocks and messages across the peer-to-peer network. A _validator_ is a full node that participates in consensus and produces blocks. Many full nodes also expose a _liteserver_ endpoint so wallets and apps can query data or submit messages without running a full node themselves.
+
+TON also has _lite clients_. They do not store chain state locally. Instead, they request the data they need from liteserver-enabled full nodes.
+
+## Node types and roles
+
+- **Full node** — stores the latest state and propagates blocks and messages. See [Node roles and modes](/ecosystem/node/overview).
+- **Archive node** — a full node that keeps the entire history for analytics and explorers. See [Node roles and modes](/ecosystem/node/overview).
+- **Validator node** — produces blocks and participates in consensus. See [Running a validator](/ecosystem/node/run-validator).
+- **Liteserver** — a mode that exposes a gateway for lite clients and APIs. See [Interacting with TON nodes](/ecosystem/node/overview#interacting-with-ton-nodes).
+
+## Who runs nodes
+
+- **Validators** — stake Toncoin, participate in consensus, and produce blocks.
+- **Infrastructure providers** — run full nodes and liteservers to back APIs.
+- **Explorers and indexers** — run archive nodes to serve historical data.
+- **Community operators** — add connectivity and redundancy to the network.
+
+## How apps reach the network
+
+Wallets and dApps act as lite clients: they do not keep chain state locally and instead connect to an [API provider](/ecosystem/api/overview) or a liteserver gateway. The gateway forwards requests to full nodes. Validators are the subset of nodes that finalize new blocks, and the results propagate back through the network.
+
+<Image
+  src="/resources/images/nodes/node-flow.svg"
+  alt="Flow from a user wallet or dApp through an API or liteserver gateway to TON full nodes and validators."
+/>
+
+## Run a node
+
+Use public APIs for prototypes and light workloads. Full nodes typically back apps that require stricter uptime targets or direct access to the network.
+
+- [Set up a node with MyTonCtrl](/ecosystem/node/setup-mytonctrl)
+- [Set up a local network with MyLocalTon](/ecosystem/node/setup-mylocalton)
+
+## See also
+
+- [Node roles and modes](/ecosystem/node/overview)
+- [Running a validator](/ecosystem/node/run-validator)
+- [Liteserver mode](/ecosystem/node/overview#interacting-with-ton-nodes)