Ethereum

Smart Contract

A self-executing program stored on a blockchain that automatically enforces the terms of an agreement when predetermined conditions are met. Smart contracts eliminate the need for intermediaries by running code that is transparent and cannot be altered once deployed. They are the foundation of DeFi applications, NFTs, and many other blockchain-based services.

Gas Fee

A transaction fee paid to validators or miners on a blockchain network to process and confirm transactions. On Ethereum, gas fees fluctuate based on network demand, meaning they can be very low during quiet periods and spike during times of high activity. Understanding gas fees is important because they directly affect the cost of sending crypto, swapping tokens, or interacting with smart contracts.

Proof of Stake

A consensus mechanism where validators are chosen to create new blocks and confirm transactions based on the amount of cryptocurrency they have staked as collateral. It is considered a more energy-efficient alternative to Proof of Work because it does not require massive computational power. Ethereum adopted Proof of Stake in 2022, dramatically reducing its energy consumption.

DeFi (Decentralized Finance)

A broad category of financial applications and services built on blockchain networks that operate without traditional intermediaries like banks or brokerages. DeFi platforms allow users to lend, borrow, trade, and earn interest on their crypto assets through smart contracts. This ecosystem aims to make financial services more accessible, transparent, and open to anyone with an internet connection.