Trading Volume
Plain English
The total amount of a cryptocurrency bought and sold in a specific time period (usually 24 hours). High volume means lots of trading activity and liquidity - easier to buy/sell without affecting price. Low volume means harder to trade and more price volatility.
Technical
Total value or quantity of an asset traded over a specified period. Volume indicators: spot volume (current asset trading), derivative volume, DEX vs CEX volume distribution. High volume relative to market cap indicates liquidity and price discovery efficiency. Wash trading and fake volume are concerns - track volume across multiple sources.