> ## Documentation Index > Fetch the complete documentation index at: https://docs.theblockchainlibrary.com/llms.txt > Use this file to discover all available pages before exploring further. # Cryptocurrency fundamentals > Learn what cryptocurrency is, how tokens move, and how networks distinguish native assets from tokens. ## Digital assets on blockchain networks Cryptocurrency is a broad term for digitally represented assets whose ownership and transfer are recorded by a blockchain or related distributed system. ## Native assets and tokens A **native asset** is built into a blockchain's protocol and is commonly used for network fees, staking, or economic coordination. A **token** is usually created through application or smart-contract logic on top of an existing network. ## Transactions A transfer generally includes a sender, recipient, amount, fee parameters, and a cryptographic signature. Once accepted and finalized by the network, reversing it may be difficult or impossible. Price, utility, governance rights, and legal treatment differ significantly between digital assets.