Ethereum

Encyclopedia Classification

Category: Blockchain Platform • Smart Contract Network • Digital Infrastructure

Discipline: Computer Science • Distributed Systems • Decentralized Applications • Digital Economy

Prerequisites

• Article 5 — Cryptography
• Article 6 — Distributed Systems
• Article 8 — Blockchain
• Article 9 — Consensus Mechanisms
• Article 10 — Bitcoin

Related Articles

Smart Contracts • Ether (ETH) • Ethereum Virtual Machine • Decentralized Applications (dApps) • Gas Fees • Layer 2 Networks • DeFi • NFTs • DAOs • Token Standards

Definition

Ethereum is a decentralized blockchain platform designed to allow developers to build and operate programmable applications called smart contracts.

Unlike Bitcoin, which was primarily designed as decentralized money, Ethereum was designed as a decentralized computing platform where users can create applications that operate without traditional intermediaries.

Beginner Explanation

Think of Bitcoin as a decentralized digital money system.

Ethereum is like a decentralized global computer.

Instead of only sending money:

Ethereum allows people to build programs that run on a blockchain.

Examples:

• Financial applications
• Games
• Digital marketplaces
• Identity systems
• Organizations
• Digital assets

The Core Idea of Ethereum

Bitcoin answered:

"Can we create digital money without a central authority?"

Ethereum asked:

"Can we create an entire digital economy without central authorities?"

The Creation of Ethereum

Ethereum was proposed in 2013 by:

Vitalik Buterin

The Ethereum network launched in:

July 2015

Ethereum Founders and Early Contributors

Ethereum was created by a group of developers and researchers.

Important early contributors include:

• Vitalik Buterin
• Gavin Wood
• Joseph Lubin
• Charles Hoskinson
• Anthony Di Iorio
• Mihai Alisie
• Amir Chetrit

Vitalik Buterin

Definition

A programmer and researcher best known as a co-founder of Ethereum.

Contributions

Vitalik helped develop the original Ethereum concept:

A blockchain capable of running general-purpose programs.

Why Ethereum Was Created

Bitcoin was intentionally limited.

Bitcoin focused on:

• Security
• Scarcity
• Monetary sovereignty

Ethereum expanded blockchain functionality by introducing:

• Programmability
• Smart contracts
• Decentralized applications

Ethereum's Purpose

Ethereum aims to provide:

A Decentralized World Computer

A global network where anyone can run applications without relying on a single company.

Traditional Applications

Most applications rely on centralized servers.

Example:

A banking app:

User

↓

Bank servers

↓

Database

Ethereum Applications

Ethereum applications operate through:

Users

↓

Blockchain network

↓

Smart contracts

The Ethereum Network

Ethereum consists of:

Nodes

Computers that maintain and verify the blockchain.

Validators

Participants who secure the network through Proof of Stake.

Developers

People creating applications and infrastructure.

Users

People interacting with applications.

Smart Contracts

The foundation of Ethereum.

Definition

A smart contract is a computer program stored on a blockchain that automatically executes actions when predetermined conditions are met.

Beginner Explanation

A vending machine is a simple smart contract.

You:

1. Insert money.
2. Select a product.
3. The machine follows programmed rules.
4. The product is released.

No employee is required.

Blockchain Smart Contracts

Example:

"If Alice sends 1 ETH, transfer ownership of this digital item."

The blockchain executes the rule automatically.

Why Smart Contracts Matter

Smart contracts allow:

• Automated agreements
• Decentralized applications
• Financial systems
• Digital ownership
• Programmable assets

Ethereum Virtual Machine (EVM)

Definition

The Ethereum Virtual Machine is the software environment where Ethereum smart contracts execute.

Beginner Explanation

The EVM is like the operating system inside Ethereum.

It provides the rules that allow programs to run consistently across thousands of computers.

What the EVM Does

The EVM:

• Executes smart contract code
• Processes transactions
• Calculates computational costs
• Maintains blockchain state

Ethereum Programming

Ethereum smart contracts are commonly written using:

Solidity

The primary programming language for Ethereum smart contracts.

Other languages include:

• Vyper
• Yul
• Rust (through compatible systems)

Ether (ETH)

Definition

Ether is the native cryptocurrency of the Ethereum network.

Uses of ETH

ETH is used for:

Transaction Fees

Users pay fees to process transactions.

Staking

Validators lock ETH to secure the network.

Collateral

ETH can be used in decentralized financial applications.

Asset

Many people hold ETH as a digital asset.

Gas Fees

Definition

Gas refers to the computational work required to perform actions on Ethereum.

Beginner Explanation

A car needs fuel to move.

Ethereum transactions need gas to operate.

Gas Pays For

• Sending ETH
• Using smart contracts
• Creating tokens
• Trading assets

Why Gas Exists

Gas prevents abuse.

Without fees:

Someone could spam the network with unlimited requests.

Ethereum Consensus Change

Originally Ethereum used:

Proof of Work

Similar to Bitcoin.

In 2022 Ethereum transitioned to:

Proof of Stake

This event was called:

The Merge

The Merge

Definition

The transition of Ethereum's consensus system from mining-based Proof of Work to validator-based Proof of Stake.

Why Ethereum Changed

Goals included:

• Lower energy consumption
• Improved network efficiency
• Future scalability improvements

Ethereum Staking

Validators participate by locking ETH.

A validator:

• Confirms transactions
• Proposes blocks
• Helps secure the network

Ethereum Token Standards

One of Ethereum's biggest innovations was creating standards for digital assets.

ERC-20

Definition

A standard for creating fungible tokens.

Examples:

• Governance tokens
• Stablecoins
• Utility tokens

ERC-721

Definition

A standard for unique digital assets.

Most commonly associated with:

NFTs

ERC-1155

Definition

A flexible token standard supporting multiple asset types.

Decentralized Applications (dApps)

Definition

Applications that operate using blockchain networks instead of traditional centralized servers.

Examples of dApps

Finance

Decentralized exchanges

Lending platforms

Stablecoin systems

Gaming

Blockchain games

Digital ownership systems

Collectibles

NFT marketplaces

Digital art platforms

Organizations

DAOs

Ethereum Ecosystem Categories

Ethereum helped create entire industries.

Decentralized Finance (DeFi)

Financial applications without traditional banks.

Examples:

• Lending
• Borrowing
• Trading
• Yield systems

NFTs

Digital assets representing unique ownership.

Examples:

• Art
• Gaming items
• Memberships

DAOs

Blockchain-based organizations governed by participants.

Layer 2 Networks

Ethereum's popularity created scaling challenges.

Layer 2 networks process transactions separately while using Ethereum for security.

Examples:

• Rollups
• Optimistic Rollups
• Zero-Knowledge Rollups

Ethereum Scaling Problem

Ethereum faced challenges:

High Fees

Heavy usage increased transaction costs.

Limited Throughput

The base layer can only process a limited number of transactions.

User Experience

Blockchain interactions can be complex.

Ethereum Scaling Strategy

Ethereum's roadmap focuses heavily on:

• Layer 2 networks
• Rollups
• Data availability improvements
• Network efficiency

Ethereum vs Bitcoin

Ethereum Advantages

Programmability

Developers can build applications.

Large Developer Community

One of the largest blockchain ecosystems.

Network Effects

Many applications and users already exist.

Innovation

Ethereum has driven major crypto developments.

Ethereum Limitations

Complexity

The system is difficult for beginners.

Fees

Usage costs can become high.

Competition

Other blockchains compete with Ethereum.

Smart Contract Risks

Programming mistakes can create vulnerabilities.

Common Misconceptions

"Ethereum is just another cryptocurrency."

False.

ETH is the asset, but Ethereum is the entire blockchain platform.

"Smart contracts are legal contracts."

Usually false.

They are computer programs.

"Ethereum is controlled by Vitalik."

False.

Vitalik is influential but does not control the network.

"Ethereum replaced Bitcoin."

False.

They solve different problems.

"Proof of Stake makes Ethereum completely centralized."

Debated.

Ethereum's decentralization depends on validator distribution, staking concentration, infrastructure, and governance.

Real-World Applications

Ethereum is used for:

• Digital assets
• Decentralized finance
• NFTs
• Gaming
• Organizations
• Tokenization
• Blockchain applications

Key Takeaways

• Ethereum expanded blockchain technology beyond digital money.
• It created programmable blockchain applications.
• Smart contracts are the foundation of Ethereum.
• ETH powers network operations.
• Ethereum introduced token standards that created entire industries.
• Ethereum uses Proof of Stake after The Merge.
• Ethereum is one of the most important infrastructures in the crypto ecosystem.

Related Encyclopedia Articles

• Smart Contracts
• Ether (ETH)
• Ethereum Virtual Machine
• Gas Fees
• DeFi
• NFTs
• DAOs
• ERC-20
• ERC-721
• Layer 2
• Rollups
• Solana
• Alternative Layer 1 Blockchains
• Tokenization

Encyclopedia Notes

Ethereum represents the second major phase of blockchain development.

Bitcoin introduced decentralized money.

Ethereum introduced decentralized applications.

Together, Bitcoin and Ethereum form the technological foundation upon which most of the modern cryptocurrency industry was built.