Ethereum is an **open-source blockchain** platform that is decentralized and programmable. Unlike Bitcoin, which was initially designed as an alternative digital currency, Ethereum was created as a platform to run **smart contracts** and **decentralized applications (dApps)**.

Often called the "World Computer," Ethereum allows developers to build various financial services, games, and social networks on its infrastructure without central authority.
### Main Components of Ethereum
* **Ether (ETH):** This is the native cryptocurrency of the Ethereum network. ETH is used to pay transaction fees (often called "gas") and as collateral in the network's security mechanisms.
* **Smart Contracts:** Computer programs stored on the blockchain that automatically execute when certain conditions are met. This eliminates the need for third-party intermediaries.
* **Ethereum Virtual Machine (EVM):** The software environment where all smart contracts are executed. The EVM ensures that the same code runs identically on every computer (node) in the network.
* **Proof of Stake (PoS):** The consensus mechanism used by Ethereum (after transitioning from Proof of Work) to secure the network through *staking*, which is much more energy-efficient.
### What Can Be Done on Ethereum?
Ethereum has become the foundation for various innovations in technology and finance:
1. **Decentralized Finance (DeFi):** Banking services like lending, trading, and insurance that operate without traditional banks.
2. **NFTs (Non-Fungible Tokens):** Unique tokens representing ownership of digital or physical assets, such as artwork, music, or in-game property.
3. **DAO (Decentralized Autonomous Organizations):** Organizations managed by code and token-holding communities, rather than traditional leadership structures.
Main Differences: Ethereum vs. Bitcoin
| Feature | Bitcoin (BTC) | Ethereum (ETH) |
|---|---|---|
| **Main Purpose** | Store of value (Digital Gold) | Decentralized application platform |
| **Programming Language** | Limited | *Turing-complete* (highly flexible) |
| **Block Time** | About 10 minutes | About 12 seconds |
| **Consensus Mechanism** | Proof of Work (Mining) | Proof of Stake (Staking) |
Simply put, if Bitcoin is a highly secure digital ledger, then Ethereum is an operating system that allows anyone to build "applications" on top of that ledger.
Are you interested in learning more about how *gas fees* work or how to start developing applications on its network?
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