Arbitrum is a Layer 2 network on Ethereum, designed to enable developers to create and deploy highly scalable smart contracts at low cost. It utilizes an Optimistic rollup solution to enhance speed and reduce costs by executing transactions off-chain and later validating them on Ethereum's Layer 1. This tutorial guides developers on using Arbitrum, specifically on the Arbitrum Rinkeby testnet, to develop and deploy smart contracts, with an emphasis on integrating Chainlink Price Feeds for reliable and secure off-chain data. Chainlink's decentralized oracle network aggregates high-quality data from multiple providers, ensuring that smart contracts can access accurate, tamper-resistant price information, which is crucial for building advanced DeFi applications. The guide includes practical steps for setting up the Arbitrum testnet, connecting to the Chainlink network, and writing Solidity functions to retrieve price data, as well as ensuring the availability of the L2 sequencer using Chainlink’s oracle services. This enables developers to leverage Arbitrum and Chainlink to create cost-effective, high-speed DeFi applications on Ethereum.