Decentralized applications (dApps) are software applications that operate on a blockchain rather than relying on centralized servers, offering benefits such as enhanced security, zero downtime, and censorship resistance. This tutorial outlines the creation of a basic dApp that retrieves the Ethereum price using a Chainlink Data Feed and stores it in a smart contract. The process involves setting up smart contracts using tools like Hardhat and deploying them on the Rinkeby test network. The frontend is developed using React and Ethers.js, allowing user interaction with the smart contract via a straightforward user interface and a Web3 wallet like MetaMask. While dApps offer significant advantages over traditional applications, they also present challenges like maintenance complexity and performance overhead. The tutorial provides a comprehensive guide to setting up a dApp infrastructure, including backend, frontend, and deployment steps, demonstrating the integration of Web3 technologies for building decentralized software solutions.