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Burning is a process of reducing supply of a certain Jetton, mostly in order to create deflation.

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Web services

To burn Jettons manually, use a web service, for example Minter:
  • Connect your wallet using TON Connect.
  • Enter the Jetton master contract address into the “Jetton address” field.
  • Click the “Burn” button in your wallet’s balance field and enter the amount you want to burn.
  • Confirm burning in your wallet application.

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Another approach

An alternative way to burn tokens is to send them to a “zero” account, see How to transfer page. A wallet app can be used for this.

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Programmatically

In more complex cases, it is usually done with an SDK (for example, assets-sdk) that handles low-level message serialization details. The provided example uses TON Center API. You’ll need a mnemonic of a wallet that will pay for the burn. JETTON_WALLET_ADDR stands for the Jetton wallet that holds tokens that will be burned. 
import { Address, toNano, WalletContractV5R1, TonClient } from "@ton/ton";
import { mnemonicToPrivateKey } from "@ton/crypto";
import { AssetsSDK, createApi } from "@ton-community/assets-sdk";

const NETWORK = "testnet";
// a list of 24 space-separated words
const MNEMONIC = "foo bar baz ...";
const JETTON_WALLET_ADDR = Address.parse("<JETTON_WALLET_ADDR>");

async function main() {
    // create an RPC client that will send network requests
    const client = new TonClient({
        endpoint: "https://toncenter.com/api/v2/jsonRPC",
    });

    // extract private and public keys from the mnemonic
    const keyPair = await mnemonicToPrivateKey(MNEMONIC.split(" "));

    // create a client for TON wallet
    const wallet = WalletContractV5R1.create({
        workchain: 0,
        // public key is required to deploy a new wallet
        // if it wasn't deployed yet
        publicKey: keyPair.publicKey,
    });

    const provider = client.provider(wallet.address);

    // sender is an object used by assets-sdk to send messages
    // private key is used to sign messages sent to a wallet
    const sender = wallet.sender(provider, keyPair.secretKey);

    // create an assets-sdk client
    const api = await createApi(NETWORK);
    const sdk = AssetsSDK.create({
        api,
        sender,
    });

    // create a client for interacting with given jetton wallet
    const jetton = sdk.openJettonWallet(JETTON_WALLET_ADDR);

    // burn 1200000 jettons
    await jetton.sendBurn(sender, 1200000n);
}

void main();