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2. Getting ETH on Arbitrum
The native token on Arbitrum network is ETH.
In order to complete most basic transactions on the network, you will need to pay gas. Gas fees are paid in ETH.
There are various ways in which you can acquire ETH on Arbitrum.
You may purchase various cryptocurrencies within your Metamask wallet via third party's.
https://metamask.io/buy-crypto/
Trust Wallet also supports similar functionality and you may find guidance in the link below
https://blog.trustwallet.com/blog/how-to-add-the-arbitrum-token-to-trust-wallet
Additionally you can opt to use one of many various Centralized Exchanges, or "CEX" to purchase ETH.
In the link below you will find a list of exchanges.
Some Centralized Exchanges may not be available in your jurisdiction.
If you have already ETH on the Ethereum network and wish to bridge those assets over to Arbitrum, you can use this bridging tool provided by Arbitrum to transfer, or "bridge" these assets to the Arbitrum blockchain.