What is MetaMask? Really… What is it?

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Sean Choi
6 min readJul 15, 2018

MetaMask is a bridge that allows you to visit the distributed web of tomorrow in your browser today. It allows you to run Ethereum dApps right in your browser without running a full Ethereum node.

… is what they say in their official website https://metamask.io/. However, to understand what this statement really means, you need to first understand what each of these words mean. I mean what is “distributed web” and what really is “distributed web of tomorrow”?. What is Ethereum dApp and a Ethereum node? This article will try to briefly demystify each of this word and introduce a tool called MetaMask, which will let you really explore the distributed web of tomorrow.

Distributed Web (left) vs Centralized Web (right)

First of all, lets start with identifying what distributed web is. Most of the things you see on your browser (e.g., Chrome, Firefox or Opera.), including this article, comes from a computer that sits in a chilled room within a large data center somewhere. Many little computers and phones, which we often call clients, connect to the large central server to download bits of information that they need. This is how the modern web works. We call this the Centralized Web, because, you guessed it, all the data sits…

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Sean Choi

Stanford, SF, SV-based educator & researcher & engineer writing about interesting technical things. seanschoi.com