Why is Metamask needed for Ethereum Dapps?

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When you design a smart contract on top of ethereum, it is like a backend server. Therefore in order for you to interact with the contract you need a front end. In front end, we use a library call web3.js which helps us to interact with the contract easily and intergrated with metamask.

• Advantage #1: User friendly

You can use desktop wallet that run will full node or partial node, it will works, because Ethereum Smart Contract is just a back end. However, it is not user friendly for non-developer because you have no idea what functions to call or send.

• Advantage #2: No need to download big files

With MetaMask, you are running on their network node, so you don't need to download a full blown full node or partial node on your desktop.

• Advantage #3: Easy to develop

As a blockchain developer, I prefer to use MetaMask in my development process because it helps me to test out my app quite effectively, Therefore it is useful to do a backend and design front end integrate with metamask