Explaining Ethereum
Ethereum is, first and foremost, a blockchain. Ethereum is a technology that runs on many computers and provides its consumers with a guarantee that they are trusting a solid system that will work as expected.
A web of thousands of computers connected all over the world are called nodes and they allow others to get the information they need while trusting the code with the goal of decentralizing the internet as we know it.
Why is decentralization so important for the internet? Because we have come to a point where a few big companies control the information that you and I can produce or consume.
Governments have so much power that they are getting out of control with their rules. They are biased toward what benefits them and their governors. And it's understandable—whenever some entity is at the top of the food chain, it is inevitable that they end up controlling the entire system below it sooner or later.
Ethereum's goal is to create a censorship-resistant and open platform that allows people to trust smart contracts that enforce rules that cannot be controlled by third-party entities.
When you publish a smart contract, you have a 100% guarantee that the code will run at any point and nobody will be able to interfere with it, unless the rules of it say so.