Definition
The fee paid to process and include a transaction on a blockchain network. On Bitcoin it's called a transaction fee; on Ethereum it's called a gas fee. Fees go to miners or validators.
Why It Matters
Network fees are a real cost of using blockchain. They vary with demand — understanding them helps you time transactions and choose the right network for your needs.
Example
Sending Bitcoin on the main Bitcoin network might cost $2–$10. Sending the same amount via the Lightning Network might cost less than a cent.
Related Terms
Gas Fee
Block
Mining
Validator