How much does arbitrum cost Ethereum?

Excuse me, could you please clarify the cost structure associated with Arbitrum on the Ethereum network? Specifically, I'm interested in understanding if there are any upfront fees, ongoing charges, or transaction costs that users need to be aware of when utilizing the Arbitrum scaling solution on the Ethereum blockchain? Additionally, are there any potential gas savings or cost benefits that one might expect to see when compared to traditional Ethereum transactions? Thank you for your time and consideration.